Everybody has had thoughts of punching someone in the face or killing them when they piss us off but it doesn't mean that we're going to act on it. Just remember where these thoughts are coming from and don't acknowledge them as anything more than just thoughts.

A cognitive behavioral therapist can teach you that whenever you have these hostile thoughts, you can train you mind to transform the negative thought into a positive one. For example, every time you think of killing someone after they make you angry, you can think "I am calm, I am grateful, I am a good person, and they have no power over me."