I can’t hold it in

So basically, I have a problem that I have this anger in me. I never get angry really rarely I get but I’m holding this an inside of me for like maybe five years like for everything and I don’t know should I just bust someone’s head and get all my anger outside or what to do because I cannot hold it in I can do that. I am that guy but I don’t like violence, but I cannot hold it in for long so I am typing this to see if anybody has good idea or any advice.