You have to make the most of school. I didn't enjoy it much at all before I started getting involved in things in my senior year of high school, and after that it was probably the defining year of my entire life so far. If you spend the whole of it being mad and doing nothing, you're not gonna get much out it besides how to do math and write an okay-ish essay. You have to branch out and try new things because once you're out it's gonna that much harder to find a safe environment do it that in.
I'm also gonna say that fitting in is a meme and you're a chump if you fall for it. Don't be a richard, dress how you want, and hang out with people you like. Try not to judge other people too harshly, or at least too loudly. You'll be fine.
That said, there are some pretty bad organizational and funding issues that go on in schools. I was pretty lucky to have a friendly and mostly-sane administration at my school, but you hear all the time about kids getting suspended for dumb stuff. My school was, as far as I can tell, mandated by the state/county to redesign a huge part of the outdoor campus and install solar panels and plastic grass to save water. I don't have an issue with the intentions, but that money could've been better spent on the classrooms, several of which are still on those stuffty mobile home rooms with the wooden foundations and have been for years.