Learn to let go.
Have anger from over a past event? Let is go. It's a tough thing to do, but do it.
Angry over a lost love? It's over and its gone and you need to let it go.
Been betrayed? Welcome to the club. Get over it. Let it go.
Change is a difficult thing to do. Sometimes we hold on to even our misery because its easy to do.
Fight it. Fight to let go.