Feelings and behaviors are not the same. This distinction between feelings and behaviors is the crucial first step towards being free from losing self control. Anger is a basic, core emotion. Actually anger is a second, defensive response to a situation, intended to protect the person from further harm. Embarrassment, which is a combination of hurt and fear, can also trigger a defensive anger response.
Anger is a useless emotion.
While many of us think of anger as simply being a destructive emotion, it can actually be very useful to the person who is learning about himself and wants to continue growing as a person. Since it is defensive by nature, triggered anger can indicate to us when we're in situations that leave us psychologically exposed. Knowing that can help us take steps to become less vulnerable in that way. Come back later to try and resolve it, though. Close your eyes and take a deep breath.