I am having issues controlling my anger.

I have this type of anger where if you get me angry you'll most likely get hospitalized or killed as a result and I don't know how to tame it.

Everything lately is pissing me off. I've spent the last two years of my life scrubbing dishes for a living while the rest of society plays with their genitalia and twittles their thumbs on their newest smart phones or devices. Spoiled plutocrats.

Recently someone in my class won a local competition that others say doesn't mean much, but to me it meant everything. I put 400% more work into that competition than the other people. When the other person won I took their work and sent it to everyone in my class and directly attacked the settlement in their failures to recognize true hard work over someone taking short cuts.

Now my work is trying to have me stay later at night because "I live right down the road," when I have a life of my own! **** them! I'm so sick and tired of society to the point where I want to go out and kill, starting with the person who won that competition by unjust means and then their family.

I've tried not thinking about my loss at that competition but it just keeps coming back to me! And every time it comes back I become even more enraged. I'm not the type of person who can just forget, but I can forgive.

How can I handle this situation and my rage effectively?