Why have I always been picked on my entire life?

I have this gut instinct that people always prejudge and scrutinize the very essence of my being without giving me a chance. I used to get picked on pretty bad in my younger school days, been in no less than 2 big school fights and sort of developed a reputation which made people eventually stay away from me. However this was a long time ago and I've tried to move on. I've tried my hardest believe me. But it's the little things like the comments behind my back, the jokes, most notably from the little F***ers down my street who always laugh and scorn me. It reinvigorates my hatred from those days. The underlying realization of how society spat in my face resurrected. Don't worry I'm keeping everything inside of me, every last detail. While I sit here typing this my muscles ache from my new workout routine. What spurs me on are the memories, they keep me going. In a few months time one would not even contemplate taking me for a joke. I will take back from society what it took from me. I've tried being the nice guy but nice guys finish last. From now on it's no more mister nice guy. It hurts so bad...