I guess the main problem started in kindergarten and the lack of power to deal with problems concerning other kids and the lazyness and incompetence of the adults. If i was teased, usually nothing was done about it. If someone hit me, I was told to hit them back. Twice I was told this and they quickly realized the mistake they had done. Every time a kid teased me or hit me, it would end in a fight between my inner animal and the kid in front of me, unblocked, blind rage.
As it was the only thing I knew in those situations, I kept doing it and later on skipped the "ask the adults" part and went straight to the beating. This all lead up to my Asperger's diagnosis.
it really came to a head in 6th and 7th grade when the bullying started. The only thing done to remedy the problem from the teachers was a quick talk with whatever bully was after me, and epectedly things got worse. I knew they did nothing and my defenselessness turned into an enraged beating machine with the consequences that ensued. Especially those two kids from the grade below, Patrick and René could light my pee on fire.
it came to an end when my rage went in the direction of my best friend, Amy in 8th grade. I hit her hard in the shoulder with a fist. After that I was extremely depressed, but determined to do everything to cage that beast in. I went through everything from drugs to meditation, and in the end it was thorough meditation and self-control exercises that did the trick. Although she since forgave me, I still have a recurring and extremely painful image in my memory of me hitting her and her crying.
I lashed out because of inaction and powerlessness, hovever i've never actively harmed myself.
It was somewhat painful to write this, but I hope it helps in your search.