How do i deal with an anger problem?

I feel as that i have developed an anger problem. I say thing to people I don't want to say and am always hurting my hand punching ****. I think to some degree it may start to cost me my job. I need help in controlling it. People tell me to count to 10 or 20 but that never works for me. I've been thinking about getting counseling, but I can't afford a therapist. I really think i need some help. I don't wanna hurt someone or myself. Also i exercise a lot and am on concerta (an add medication) If that helps any. Im coming to the conclusion that this has started when i was a young kid. I remember me and my brother getting into fights and him running away when he saw how pissed I was. I don't know if my parents have anything to do with it either. Just if anyone has some advice?