Fresh, the important thing to remember is that anger is an emotion and will pass. I agree with previous posters that the more you work on it the more you will be able to control it. And I am impressed that you have identified it as a problem at your age. I don't mean to be patronising - I was brought up with the idea that I "had a temper" and was therefore a bad person. I used my temper as a get-out clause for many years and only realised I could do something to change or at least improve the hold it had over me in the last year. I am 35.
Anger can be controlled. You are not a bad person for feeling it. Being competitive is good, but need not lead to anger. Read up on it. Or get counselling (not suggesting you are out of control, just that to change thought patterns is hard but very worthwhile).
The hardest things to change within ourselves are usually those that will benefit us the most.
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