I'm stuck in a school with minors who think they're grown

I just turned 21 years old and i go to a school that helps you get into college.

It's annoying and kinda dangerous that I'm surrounded by minors in a school. I was talking to another schoolmate about things i won't discuss here. It didn't realize he was a minor until some stupid boy started saying they were minors. They were all in the bathroom smoking, dressing acting grown. I really hope i don't end up in jail. It's bad enough being a black man.