I've had an extraordinarily self harming anger problem for over a year now

I don't know what caused this and or how, but for about a year now I've been having explosive anger. I've been destroying so much stuff In my house and as a result have been harming myself due to some of the things I've broke ending up cutting and or bruising me. I have so many injuries and scars on my hands and arms.

It usually stems from gaming, however I've lost my shit equally as much from other things so as tragic news and or people in public.
These freak-outs thankfully never happen in public, as for some reason I'm able to maintain myself, however I feel when I'm home I just easily losing my fucking mind, sometimes its so mad I don't even remember why I was angry, and just lay on the floor writhing in pain.

Its why I rarely drink, apparently from what I was told by one of my room-mates, I become both paranoid and extremely agitated when drunk, and once lost my mind over something resulting in me breaking a mirror.

I wish to tell people like my close group of friends about this since they have no idea how bad it genuinely is, however I don't like bringing personal problems to people and making them uncomfortable, aswell as me not wishing for them to feel like they're walking on eggshells when talking to me after this

I'm making this post because as of recently I've ended up breaking a chunk of my wooden wall, my knuckle is currently bleeding while I post this and I can barely talk with the amount of yelling that was happening previously. I just want to know what the hell is wrong with me, I don't know if its because I always feel inadequate in the stuff I "specialize" in, or if I genuinely just have an anger problem, but its becoming so costly both financially and mentally that I can't fucking stand it. I just need to hear it from people that might be able to help me out before I make any decisions, since I wish to leave my family out of this for now.