Relax! I know it seems like it’s easier said than done, and I don’t expect every single one of your fears to have been alleviated by reading this one article. But always remember that a) it’s normal to feel this way when entering a new school, and b) everyone else will be feeling the same way.
Don’t let your nervousness limit your enthusiasm and willingness to try new things because you'll regret it in hindsight. Be brave, be bold, and be you.