Is bottled up anger bad? Can it cause a mental problem?

I rarely get angry and when I do, I get over my anger incredibly quickly by being by myself. Is it bad to have so little anger? I also, over the previous five years have lost my ability to feel guilty about things I do and have lost my compion for people. Example - my brother caught fire and I remained perfectly calm during the day. I didn't feel anything. I also have lost emotions to the point that I feel very little to no emotion over things. Could this be because of the pent up agression, or is it something else? What can I do?