Private School! HELP!?

Well, next Tuesday will be my first day ever at Private School. I'm in the 8th grade and this will be my 3rd school. I don't know if I'll adjust perfectly. I have to go to church every Friday, I have to wear uniforms, and if you want to be on a sports team, you don't need to try out! Please, if you've been at Private school, explain what it will be like for a public schooler like me!!!