Trev,
JapanZen is actually telling you some things that would be very good for you. But yeah, I know how you feel. You just want to beat the shit out of something, and who could blame you? What you need is some way of releasing all that anger without getting yourself into trouble.
One of my little brothers here last year had an excellent solution for the anger problem. He was getting suspended from school a lot for fighting, and once he told his father what the problem was they were able to work on it together. One thing his father did was get him a punching bag, which he proceeded to batter every time he felt angry.
The problem with that, however, is that it doesn't help you to see that the solution isn't to fight and hit things...or people. What you need are safe activities that let you get these feelings out. How about football, running or swimming? All those use up a LOT of energy.
Ultimately, though, it does come down to a matter of learning to relax and cope with anger and frustration in a way that doesn't hurt you or others. The ability to do this doesn't come overnight, but it IS the goal to aim for.
Much love,
Larry