The first step to controlling our anger is a clear admission that anger is normal, even for the most devout Christian. That's because Christianity is for real people who have honest emotions. We need to start by simply admitting it. There is no Biblical reason to have a sense of guilt over simply feeling anger. The sin is not in what we feel, but in what we do with those feelings.
Anger is a very natural emotion.
It is simply a part of being a human being. Anger is as much a part of our human nature as becoming tired or getting hungry. Anger in and of itself isn't necessarily a bad thing. What's bad is what we do with our anger. In fact, there are times when anger can be the most appropriate response to a situation.