What to expect in a high school?

This. A thousand times this. People say high school is supposed to be the best four years of your life. You know what I say? Fuck that. I don't want to scare you, but I sincerely hope you have a more productive four years than I did. I graduated high school in 2004, and I haven't thought about it once since then. High school is a ridiculous, amorphous blob of idiots, morons, tools, dicks, bitches, and everything in between. The absolute worst memories of my life come from 2000-2004. Couple all of that with the fact that I didn't learn shit from any class ever, and you've got my collective feelings about the waste of time that is high school.

I agree with this 100%.
I moved to 3 different highschools (father's in the military) and each time I got to play new kid and never really have any friends. It was honestly the four worst years of my life.

The best advice I can give you is focus on your studies and get into a great college, where you can meet real human beings and not superficial plantains who apparently's world revolves around judging what you wear, how you look, and the people you hang out with.