A dream where an object is damaged can suggest that you are facing some kind of difficulty or you are not perceiving something correctly in some part of your life. Alternatively, the dream can imply that you are lacking self-esteem or self-respect.
If you damage an object in a dream then it can imply that you are feeling some level of aggression, whereas if you cause intentional harm to yourself then it can suggest that you feel a lack of self-appreciation or you are feeling pain in some part of your waking life.