How can I be less angry?

Anger is not necessarily a bad thing. If you are angry and you can talk about your feelings, that would be very helpful. Anger usually comes along with something else, like feeling sad, worried, overwhelmed, confused, and many others. Consider looking at what you notice in addition to anger and you may have a different starting point. If you get along well with friends and don't get angry with them, look at the differences. Do you feel criticized by your parents or family? Misunderstood? There could be any number of things.

I wonder if you start getting angry very slowly and it builds or if it happens quickly. Try to keep an eye on the patterns and see if you can stop and look at what else is going on as you start to get angry. Anger is a real emotion in itself. It almost always connects to something else as well.