Earlier quoted context omitted.
I mean, there is a big difference between peeing on someone and trying to choke out one of your relatives. My family is full of mental health disorders and I've experienced the damage they cause first hand. For me, it was much more of a "so this is the complete extreme" experience -- it was a good example of "almost entirely far gone."
I have no mental health disorders though. I just had some completely off the handle reactions to people bullying me, or picking on me in any way. I was one of the smallest people in my class, and it never turned out well for the other person. I would blackout with rage. I've never remembered what happened in a fight, but can still remember every detail leading up to it.
It seems to me that you had bursts of violence because you felt hurt yourself and needed to make things 'right', not just because you found joy in harming others.