Do you know anyone who had emotional and anger issues, but resolved them and changed their personality?

I did. What changed was being arrested once and losing my job another time because of it. I had to change my philosophy of life entirely. I had to realize that I need to focus on the bigger picture (someone cutting me off in traffic isnt worth a battle because I originally just wanted to accomplish some much greater tasks). I had to realize that I don't actually hate anyone, all disagreements are the result of misunderstandings and in other peoples shoes no matter whose they are I would act exactly the same way. I also had to realize that no decision can ever be made while angry and be trusted. It is not a state of being in which rational thought takes place.

These are all BIG ideas that can easily pass you by your whole life despite being told them. It is one of those situations where experiencing versus just being told are very different things.