How can I get rid of all this anger and hate inside me?

I think I am a normal enough person but someones I will find myself hating peolpe to extremes. I get very angry with certain things/people and I will then obsess over it. After this I will just sit around and simmer with hate/angry and eventually this will turn into extreme depression. What is wrong with me? This is a more or less daily thing for me. My family pretty much doesn’t like this attitude of mine either saying I goto extremes with my hatred.

Something happens that pisses me off. I start hating the person concerned. I remain angry and bitter. I then get depressed about the situation. HELP.