I don’t know how to deal with anger.

I can’t really remember a time when I expressed the emotion well. I always held it in and waited for the feeling to pass. Now that I try to express it, it feels wrong. I’m human, I’m allowed to be mad. I don’t understand why I can’t seem to get it out though. When I show just a bit of it, I feel guilty. Is it supposed to be that way? I don’t even know anymore.. I’m trying.