To shoot something in a dream, means that you already made a target and aimed to reached it as soon as it is possible. In those cases when the dreamer shoots the other human being, such dream shows the aggressive emotions towards certain person or situation. If someone has shot you with the gun, then it could reflect the relationships between you and somebody else. Maybe you are in a conflict with somebody and afraid of the consequences.
Read more about dreaming of Shot in other dream meanings interpretations.