Well, it was when I was 13. I was the shortest kid in school, and got picked on. After 7 months I caved in, my performances crashed. After that I have not had any real depressive episodes - sometimes stuff comes back: I used to do talking to people who felt lonely, kind of like a buddy program. I felt like I was soaking up their emotion and started to project it onto my own environment.
I have had temporal bouts of feeling bad apart from that, but they were usually due to relationship issues, parent issues, academic issues et cetera.
Normally my energy level is quite high already, a bit like you're saying Schizpergers.
What I'm really looking for is a way to control it more.