Being the push over has turned me into a raging p*ssed off prick?

For years until mid high school I was a push over. Id let bullies walk over me. Women never took interest. I was a p*ss poor excuse of a young man who would do anything I as told to. If you told me to lay over a puddle so you could use me as a mat I would of done it since mid high school to around age 21 my innocent mind started to understand the world better. I became less of a baby into a man. I would still act as a good neighbor to my family and friends always tried to help people in need. Since then life I would assume is normal.

Recently my corrupt job has gotten away with treating all the yard employees as garbage. We work hard labor so we are out int he sun grinding, dust and dirt on our faces, the office people are treated as royalty. The boss is as corrupt as they come. Trying to make long story short I was done with there **** and quit. Theres more to say but yahoo answers limits me on length. I want nothing more than to bust in with automatic weapons and take out every f*cking prick in 100meter radius(not really, relax. Just emphasizing how angry that place makes me). Now I'm angry all the time, won't take **** from anyone or anything everything can go to hell. Am I to blame for my bitterness? Should I have toughened up over the years to avoid this?