When you squeeze an orange, orange juice comes out, because that's what's inside. When you are squeezed, what comes out is what is inside.
What comes out of you when you are squeezed is what is inside of you.
There's nothing wrong with anger provided you use it constructively.
Anger is a choice, as well as a habit. It is a learned reaction to frustration, in which you behave in ways that you would rather not. In fact, severe anger is a form of insanity. You are insane whenever you are not in control of your behavior. Therefore, when you are angry and out of control, you are temporarily insane.
By all means give vent to your anger, let it out in nondestructive ways--if you are still deciding to have it. But begin to think of yourself as someone who can learn to think new thoughts when you are frustrated, so that the immobilizing anger can be replaced by more fulfilling emotions. Annoyance, irritation, and disappointment are feelings that you will very likely continue to experience, since the world will never be the way you want it. But anger, that hurtful emotional response to obstacles, can be eliminated.
The components of anxiety, stress, fear, and anger do not exist independently of you in the world. They simply do not exist in the physical world, even though we talk about them as if they do.