It'll be fine just be nice to everyone and make friends with a bunch of people including teachers. Just smile and if people try and be mean to you just shrug and say "ok" or "cool" because if they realize that you don't care they won't bother you

Oh yeah high school is better than middle school by far. Try not to get caught up in drama too, there will be less of it in high school, but my advise is to stay out of it.