Public School Help Please

So I’ve been homeschooled my whole life, and recently decided I needed to go to a public school, so I don’t throw myself into college without any experience learning with other people. The problem is the first school I’ll be going to is high school. That is absolutely terrifying to me and I’d like some advice for when I get there please. Things like human interaction and anxiety are things I have a lot of trouble with so I’m a little scared to do this.