Notice what it feels like to want something you don't have. Make friends with your suffering. Notice what happens to your mind when you do satisfy a desire. And notice what happens when you don't get what you want, or when you lose the object of desire. Anger is the inevitable result.
Anger is thwarted desire.
Watch your mind. Do this as you move through your daily activities. Don't try to do anything about this yet. That will come later. For now, just watch, watch.