As a lot of people during our childhood taught us that some emotions are bad and not to be "felt" cause if you do you're a bad guy, a lot of people may bring this kind blockages like yours into their adolescence and adult life. I don't know if this is your case, but I think Ares is the best God to call forth if you want to cultivate your anger (which I think is a very useful, important and natural emotion not to be oppressed). Try to call on the God and invoke his energy safely