What do you think most younger people not ever being able to afford their own property?

Housing prices are extremely expensive because of government intervention in the market. Local governments have artificially restricted the supply of new housing in order to intentionally make it more expensive. Unironically: the free market would make housing less expensive, like it did when our parents' generation were buying houses.

Or the fact that grocery costs have been skyrocketing to unaffordable levels even if you make good money

Food inflation would not be solved by state intervention. I don't think there's any serious economist who will tell you that food inflation is caused by unfettered capitalism.

All while billionaires are hoarding unfathomable amounts of wealth? Extreme poverty might not be as high globally but regular poverty is gaining traction at record speeds.

Wealth inequality is gaining traction. The standard of living of the average poor American is better today than it was in the 1960s. What has changed is how we feel about it. Wealth inequality makes us mad, but it has not resulted in worse overall living standards on an absolute scale.

How do you guard against that when having vast wealth enables you to trick people into voting against their best interests?

I think we should solve specific problems. Some problems can be solved with more regulation (dismantling monopolies, safeguarding elections) and others can be solved by reducing regulation (taking away authority from local zoning boards, reducing the amount of legal hurdles for building public transportation).

But none of these problems are caused intrinsically by the existence of private property. Various European liberal democracies manage to provide high quality of life for their people without resorting to socialism

capitalism ends in the extreme poverty that you say it solves.

There is no evidence to support your claim. To the contrary, the evidence suggests that since 3rd world countries began liberalizing their markets from the 1970s/80s onward, it has resulted in huge increases in quality of life for their poorest citizens.

The same cannot be said of socialism, which experienced a worldwide delegitimization from the 70s onward as it collapsed under its own inherent contradictions and failed to provide for the people living under it.