Hey, I'm terrified about high school...?

I think maybe you should see a school counselor, or at least talk this through with a friend. It's normal to be nervous for the first week or two, but if it's been a month and hasn't eased at all, something is wrong. What you should also do is just RELAX. Don't schedule anything for one night, and get all your homework done before that night, and then just relax. Take a bubble bath, go for a walk, play with a pet, read a book, watch a movie at home in your pajamas, whatever is relaxing and comfortable for you. Take a few deep breaths. Even if you fail one ignment, it doesn't mean you're going to fail the entire cl. It's okay to make mistakes. There's a saying; A man who never made a mistake, never made anything. And it's 100% true. You have to make mistakes to learn. And you WILL learn, and you WILL do fine, if you only RELAX!