High school is exhausting :/

I've been in high school for 2 days so far and I'm already exhausted. I went to a private school all of middle school, so I know absolutely nobody at the high school I go to! I have only 2 or 3 friends in the school out of the hundreds of kids, I'm not really conditioned to socialize in public school so I'm really awkward and I'm really behind on my work because going to private school put me behind. I don't know, maybe I'm just not ready for public school yet but it's really overwhelming and nerve-wracking to even be in the building! All my teachers for first semester are pretty nice except my scary civics teacher who is also a football coach so that automatically makes him scary, so that's overall pretty good but that's the only half-good thing about high school so far!! (¬`‸´¬)