Self-esteem improves when you look to the good within you and not to the bad, flawed or inadequate. When you become aware of excessive anger within you, you can begin to talk to yourself in a different way. Letting go does not mean I'm out of control. Letting go makes me feel better, and that will make the situation better. Anger is not controlling me, I am the master of my anger.
Anger is destructive.
Write down or make a mental note when you frequently feel excessive anger or express it either outwardly toward others or inwardly toward yourself. Become aware of the circumstances that trigger your reaction and mentally prepare yourself for future occurrences the next time. Prepare by rehearsing how you will respond when your anger begins to show itself. Then, when the situation arises, you will be better able to make a positive change in yourself. You may not always succeed, but you will make progress, especially when you have small successes.