As a child, I used to throw tantrums all the time. I think part of growing up is realizing you can't always get your way. Not losing your temper is just an extension of that. Anger is like any other negative emotion: a signal that something is wrong. There's no point in wallowing in it. The one time in the past five years I allowed myself to get angry was stupid because it turned out to be an issue of miscommunication. Anger only shows you are not in control of yourself.