What Cinjin said.
While I'm sure it's different for everyone, you will never again have as many friends, or as much time to spend with them. Granted, I was really popular, but I still occasionally got picked on. But more often got involved in dramas, many of which seem strange in hindsight (including my own role in making many of them much worse than they had to be). Not to be dismissive of the very real feelings involved, but maybe what psychologists say about adolescence being a period of great emotional instability and social development is true, and the feelings have fallen away from my memories. Still, I would go back if I could. Not that there are no good times ahead of you after high school, but high school is special in spite of all the hard feelings.