I was a fairly violent person when I was younger, though most (if not all) of it was directed towards my older brother. Mostly because he'd continuously tease me, then I wouldn't be able to think of a come back, so I'd resort to hitting him instead (mostly slapping him on the arm). It didn't help that he was much bigger than I was, so I didn't feel bad about it at all.
Now, I don't consider myself to be very violent. I'll playfully punch my friends (more like a slight shove, really) very rarely, but that's really about it.