Some of the other comments touch on it, but usually mixed with other items, so let me reiterate. Your metabolism is going to slowly wane. Keep an eye on your weight and reduce your calorie intake now. It’s really easy to think “meh, so I’m 10 extra pounds, I can easily lose that later” but by later you will be 15 extra pounds. If you’re gaining muscle, that’s one thing, but keep yourself from gaining fat as much as you can.

Money is very easy to spend, but Money is so very hard to make. Be cautious with your money

At that age, I was trying my hardest to figure out what I'm doing, to be together like the older adults.

I'm 39, I don't have a clue what I'm doing and I'm more together than most of my coworkers, many who are older than me.

We're all just trying to figure it out, so when you look up and think you don't know what you're doing, you're with everyone. And if you know someone who says they have everything together and don't have any issues, be wary as they likely have a lot of blind spots to their life.

Who you are now, isn't likely who you'll be in 6 years. You'll change a lot over the next few years as you become an adult. Legally, becoming an adult is the difference of a day. But actually maturing into an adult takes time and effort. Yes effort, you'll meet plenty of adults who cling to their highschool self.

I don't know if alcohol is still placed on a pedestal like it was in my teens, but alcohol isn't that great. It's an expensive poison humans can sorta metabolize. It can taste good, but moderation is key. The point isn't to get drunk. As an adult who can drink anytime I please, is generally would rather just have water.

Now is a great time to get into a fitness routine.

Take care of your body is the only one you have, use sunscreen.

Spend time with your parents and people you love they are not going to be around forever, do things they like.

You have time, don't rush into things. Don't think you are 25 you should have a family by now, life is not a race each person reach goals differently and not all have the same goals. Search what makes you happy and do it.

Worry only for what you control, if you can control it you can fix it, resolve it so look for solutions but don't worry about what is out of your control, you won't be able to fix it you have to accept some things are they are and learn to life with them being that way.

DONT DO IT!!

THERE'S NO TURNING BACK

If you aren't already, start going to the gym now and don't ever stop, or you will regret it by your late 30s. I stopped going at age 30; it's only been seven years since but I can already feel my body falling apart. Everything hurts all the time and it doesn't stop hurting.

You spent 18 years learning to navigate a gated world. You will do just as much learning in the next 18 navigating a newly ungated one.

Think about the sort of kindness you would want to treat a younger version of yourself as he fumbled through that learning. Practice treating your new "young" self with that kindness today. It will pay dividends.

Lots of good advice here and I am not THAT old but here are a few things I wish I had realized sooner in life (in no particular order or theme):

• No one really knows what they are doing, more experienced people usually have just made the mistakes already.
• There is a difference between being correct and getting someone to agree you are correct, the former is the most important and the latter is not always possible or desired and when to argue and when to let someone be wrong is a skill that takes practice.
• The less time spent worrying about what other people think of you the happier you will be and the easier life will feel. In almost all situations you spend more time thinking about whatever it is than the other person does.
• Always strive to be a good and like-able person but always remember that it’s impossible to be liked by everyone, sometimes people just won’t like you and that is okay.
• One friend you can count on is more valuable than 100 acquaintances, guard and nurture your valued friendships like your life depends on it because it might some day.

The biggest thing though, there isn’t one correct way to live your life and anyone telling you differently is probably selling you something. Always try to learn something from every situation and you will be fine, mistakes are a part of life. Anyway, hope at least some of that is helpful!

Don't try and "make it" by 22 and realize that those who appear to do so are faking it.

Break stuff and figure things out, take chances and have fun. You've got time. You'll figure it out.

Specific advice like "save your money" and "enjoy your money while youre young" and "focus on education" and "forget education get a job fast" are all too nuanced and will likely get ignored anyway.

This "song" pretty much covers the important stuff.

Do the things. Do them. Don't leave them until later. There are always things. If you don't do the now things, thinking you can do them later, there will be other things later.

Not doing the things only puts you behind, possibly forever.

Do the things.

If you're going to go to college, go to a community college for your basics. Same classes, often smaller class sizes, and much less money. Just make sure the credits will transfer first.

The fact you had the initiative to ask this shows you're probably pretty intelligent. All I'll add is the perfect life doesn't exist. Do your best to enjoy it and be kind to people.

Here's my rantomendation:

Don't hit, mame or kill anybody ever. That includes when driving.

When driving pay attention to the road and only to the road. Ignore work or home or school problems. Don't zone out.

Listen to your parents but don't listen to the parts that limit you. Be gay if you are or straight or smart or whatever, be you. But listen to the good advice.

Fuck a lot

Eat healthy

Pay attention in school and learn from others. Be observant and follow in other people's steps long enough to learn to blaze your own path.

Don't get a school loan or max out your credit cards.

Work thru school in a light non interrupting way. Don't get an 8hr job, just something part time.

Get that diploma and go find a job where they pay you for what you know. Work on something you like to do. Work to live, not live to work. But to get here, don't skip steps...sweep the floor before you shoot for CEO.

Mourn your losses, everyone dies. Be happy with yours while you can. Family is everything and there's not much more than your own personal desires beyond family. But if you don't have kids by chance or by choice, still be happy. There's plenty of people who choose not to have kids or be married or be in a relationship. Have bobbies. There's a lot of you time towards the end part of your life. So Hobbies are good. Watching people is a hobby.

Be at peace. Don't hate and help others not hate. Racism is the worse. So if you can help a racist person to accept others then that's good.

Don't send dickpics. You never know when they'll show up on a leak.

Do not break the weekend safety brief.

• Do NOT add to the population.
• Do NOT subtract from the population
• Do NOT end up in the newspaper, hospital or jail.
• • IF you do end up in jail, establish dominance quickly.

Do the things you don't want to do.

You'll do the things you want to do, meaning the things you don't want to do are the important ones.

If you haven't yet, question what being a man means to you, and what being a good person means to you.

You will, throughout your life, find those definitions challenged. How you respond to the first will help you to develop a stronger sense of how you relate to your gender, and how it effects the way you interact with yourself and the world. How you respond to the second determines your character, which is how the world will see you as a person, and with sufficient introspection how you will see yourself.

Keep growing. Keep learning.

Open an IRA (or your country's equivalent), invest as much as you and still afford to live. A tiny little discomfort in the beginning isn't the worst thing. That money will grow tax free for year until you retire. The more you get in early, the more compounding works in your favor.

I just have one. Smart people learn from their mistakes. Wise people learn from the mistakes of others. You won't leave long enough to make all the mistakes yourself.

Start building credit if you’re in the US, but don’t treat your credit card like free money.

Don’t let yourself get addicted to alcohol (or any other drug).

Spend a decade commuting by bike if you can (rain or shine).

Get radicalized by the terrorists (people who just wanna have a nice safe society free of bigotry and hate).

Im probably not wise enough to give advice, but in general I think it's while you are young that taking big risks is more worth the trade offs.

Im talking risks like career wise or investment wise, business wise, etc.

The more discipline you can have without letting small lapses and setbacks get to you the better off you'll be in the future. Don't get set on something (job, relationship, philosophy) until you really know who you are and what you want, and explore WIDELY. Be honest and direct in your communication and you'll have less drama, the trash will take itself out. Find mentors, don't let them run your life. Use your body like a diesel truck.

Before you get a career, live and work in another country or travel on a budget for a year. See other places, meet new people, learn lots of new things and get out of your comfort zone. Some people just walk or bike across a continent with a tent.

You won't be able to do it later in life when you have a job, family and commitments.

Everybody else is just faking it, too.

Your brain still isn't fully developed into an adult one. Another half decade or so should equip you with the rest. Take care of it!

Don't drink and smoke.

Don't put your dick in crazy

Learn to shop, cook and eat without highly procesed foods

Clean the toilet when you are done

Internalize your rewards for doing something good - don't look for external validation from others that you are doing a good job. This is especially important in relationships. It's great to be appreciated when you do the dishes, but you should be able to motivate yourself to do it and feel pride that you are carrying your own weight.

Lift wieghts and or do some other physical activity. Its good to have two hobbies; a mental one and a physical one. The muscle you build now will be with you for the rest of your life, and its mucb easier to do it now than when you are middle aged like me.

Dont focus too hard on girls, just live your life and enjoy the experiences and relationships you build with all people; everything else will follow.

Travel, with a focus on the physically taxing things that are harder to do when you are older.

Invest what money you can, compound interest is real and it is the path to wealth (eventually).

don't make a kid

The lattory is a 'Stupid Person Tax.' Meaning that stupid people throw their money at it because they buy into the feeling versus the logic behind it. "The overall odds of winning a prize are 1 in 24.9. The odds of winning the jackpot are 1 in 292.2 million." source

You had better odds of you, a sperm cell, fertilizing your mother's egg, than you do currently of winning the Powerball jackpot.

How much sperm is in semen? A typical sperm count may range from 15 million to more than 200 million per milliliter of semen

Let that info sink in for a moment.

If you are male, you can get male pattern baldness in this age, but you can stop baldness by taking finasteride.

Just be nice. And listen. Always listen and pause before you speak. It will solve sooooo many problems.

Stay away from gambling sites. If you’ve got extra money and want to watch it grow, invest in Exchange Traded Funds (ETFs) with a low/no fee trading account. Stay away from meme stocks as well.

If you do invest, diversify your portfolio. SPY is very exciting but it’s heavily tied up in the AI bubble. Try to more international markets, clean energy, minerals, heavy industry. No matter what happens to the AI companies, we still need energy and resources to build stuff and keep our economy going.

Read about taxable and non taxable trading accounts in your country. Try to use those to avoid having your savings eroded by taxes. You will pay plenty of taxes on your income, so don’t worry about that!

Buy quality things that will last a long time.

Paraphrasing Terry Pratchett, the man who buys a good pair of boots will have dry feet for ten years, and the man who buys a pair of cheap shoes every year will spend more and still have wet feet.

The biggest advice I can give you is, you need to try to be social. It's easy to hang out with friends in high school because everyone's locked into the same building every weekday for 6 hours.

Once you're an adult, you no longer have that limitation. Even college is more of a "go to class for 2 hours a day then leave afterwards" type of experience. It's certainly liberating to not be forced to be someplace for long periods of time, but it also means that the primary reason that you hang out with your friends (ie, because they're already there with you) is now gone. It can make for a very lonely experience.

You need to go out of your way and actively maintain your friendships. Make plans to meet up at least once a week or something. Otherwise, you won't really get another chance to make deep friendships

As someone who wishes someone had told me... Adults don't know what we are doing either. It took me way too long to realize I'm not an imposter pretending to be an adult, we are all just kind of winging it.

As you grow older you'll have seen more stuff and it will be a little easier, but I can attest I don't have a clue what's for dinner, just like I don't know what new headache the next meeting will bring. Live life for life's sake, the clock will keep ticking whether you're ready or not.