Dreaming that you have done something “bad” in your dream could indicate feelings of guilt for something you did (or did not do) in your waking life. Dreaming that you are bad indicates feelings of shame (feeling like you are fundamentally a bad person). Look for other clues in the dream to indicate what you are feeling bad about. To dream that something has “gone bad” indicates neglect – there may be something in your waking life which you are neglecting to do, take care of, say, etc…