I felt really crazy during high school, like I was a bit emotionally unstable, kind of a huge asshole. But I wish every day I had as much unconstructed free time with no real major responsibilities.
But having sex with horny teenage girls, drinking alcohol and smoking for the first time, bullshitting papers, storming out of class, cutting class, getting in trouble, sneaking out at night, playing video games, having my whole life before me. That stuff was fun. The actual high school part sucked, but the other stuff was cool. I felt pretty smart in high school I guess, and I think a lot of that was an inflated ego, but that was a good feeling too.