If you used the decoy in a dream, then such dream shows the tendency of yours to make misunderstanding situations to others. Perhaps you do things not properly and people dont get it. Perhaps the dream is trying to change you and the way you were acting before. If you are in the decoy in a dream, then such dream shows the lack of self-acceptance you are suffering from. Probably you are saying not what you are thinking.
Read more about dreaming of Decoy in other dream meanings interpretations.