Every time I've seen major streamers asked similar questions, the answer has usually been "just do it." If you enjoy it, keep doing it, if you don't stop.

In all likelihood, early on you might get the occasional singular viewer, but otherwise you won't get much, which will provide you with time to get used to talking and narrating while playing, as well as develop some kind of style or tone that you want to go for.

As for concerns over what people think of you, as you get more comfortable with things, you'll find an audience who enjoys what you're doing. It's kind of the nature of the platform. You'll also get people who don't like what you're doing and really want to tell you about it, that's also the nature of the platform. They can be ignored and/or banned if it's bad enough. Probably a good idea to set some stream rules early on and enforce them.

But at the end of the day, what matters is that you're having fun.