I grew up with 6 older brothers, if I didn't know how to fight, I would've died. I knew unarmed hand to hand combat by the age of 11 and I was taught that I now possessed the power to kill someone, so I should only use it as a LAST DEFENSE. I think this is the absurd way my two army brothers thought they'd defend my honour as a pre-teen girl while they were away!!! Needless to say, I never killed anyone, I preferred peacekeeping activities.
I have had to fight, rare and always "in the right circumstances"...as a defense mechanism, especially at work when I get attacked by patients. Do I like fighting? Hell, yeah. I get a rush from it. Right now? I'd probably cry WHILE fighting. LOL, stupid PTSD.
I don't relish my successes either. I feel the need to punish myself and it sounds like this is what you're facing. The hardest thing you will have to do is put the 'fighting' back in the box it belongs in. You know the stuff, 'turn the other cheek' and all that crap. Fighting has a purpose in physically defending you, that is all. It is not a way to distract you from how you're feeling, it is not a method to avoid beating yourself up.
You remind me of something my Mom used to say to us if we were teasing each other and trying to pick a fight, she'd say, "Come 'ere and I'll give you something to cry about..." We'd laugh but she was right. We were using fighting to cry and release pent up energy.
Don't fight your feelings. Don't fight your successes. Don't punish yourself. If you need to physically hit something, try a heavy bag or a pillow....