I'm not entirely sure. Some silly things the girls at my USA high school did that was supposed to be like football for girls.
The dudes at my school made damn sure I made the football team, because they wanted an excuse to flatten me. Don't get me wrong, I started out very gentle, and they kicked my ass for a couple of weeks. But it made me very tough. In school was when it happened. Maybe I got hit too hard and something got connected in my brain, but I became extremely strong, even though I was ridiculously small.
I started beating the fuck out of them and from that moment on, I never gave up in anything I did. Sometimes I won, sometimes I lost. But in the end it looks like everything is going to work out for me. Got a cute gal who likes me, and a future to be proud of even though I used to be an awful person. You can do anything if you get yourself pissed off enough.