You may never discover the source of your anger and that is okay as well, the most important thing is to always use the Force to improve the dominion of love, patience, and compassion in the world. One’s anger can be a valuable tool to promote change; it just must be honored with restraint and caring for others beyond the self. Anger taken to extremes leads to unilateral “me first” behavior which can be deeply destructive and even lead to loss of life.
I believe it is beneficial for some to meditate and take martial arts, striving to become one with these ancient arts. Feel the Force, concentrate, find your balance, and tap the source of your energy, and then feel the connection to all things around you. I know you can make it because I, too, had to master my anger, and though it took time and training, I am now in a much more peaceful and content place. I would not have made it without pure emotional honesty and many good friends along the way.