This was a very nice post to read
I have been taking martial arts since I was 8 and I never used it to control my anger, either because I didn't have to or, I was the oldest one in class (when I was in the kid class), but when I went to the adult class I was constantly told to be more aggressive and for some reason I just couldn't bring myself to be more aggressive (just my personality). But over the past year I started getting more aggressive and I found it helping me with not just my anger but becoming calmer overall.
Again, thanks for posting this it was nice to read.