If you are in mental institution in your dream, then unconscious mind of yours is calling out for help. Perhaps you are over tired and exhausted by the problems in your waking life. Make sure you ask for help when its needed, because people are willing to give you a hand. If you are looking at the mental institution, then such dream shows how isolated and left out you are feelings from others. Perhaps you are seeking for company.
Read more about dreaming of Mental Institution in other dream meanings interpretations.