Well, you may say that you know when you are angry but the fact is that you are not aware of what you do while you are in anger. It’s like anger is out of your control. Your mind overpowers you here. This is why you always react a negative way and later, you regret your actions.
In fact, many people find it very difficult to be aware of their anger and this is only because they don’t know about the process of anger. They have never tried to find out what triggered their anger and what to do so that anger does not appear again.