There is a right and wrong way to be angry. It's easy to feel like it's your life and therefore your choice on your feelings and the expression of said. But there are two things that should guide one's anger process;
1. Be angry but sin not
2. Do not cut your nose to spite your face.
In simpler terms; It's okay to be angry, mad, upset, livid and even in a rage but do not in that flash of anger do things that you'll regret for moments past that fleeting one.
Someone once said, "...to be angry, that is easy. But to be angry with the right person, in the right way, for the right reason, now that is the difficult part...."
You have to be willing to take responsibility for everything that you allow to happen to you and learn to stop shifting/trading blames. More so, you have to know it's not all about how you feel. Feelings fade and that too shall pass.
Do the right and needful thing irrespective of your feelings (which to be honest, tend to be fickle)