Source : Webster's Revised Unabridged Dictionary (1913)

Self-conscious \Self`-con"scious\, a.
   1. Conscious of one's acts or state as belonging to, or
      originating in, one's self. ``My self-conscious worth.''
      --Dryden.

   2. Conscious of one's self as an object of the observation of
      others; as, the speaker was too self-conscious.

Source : WordNet®

self-conscious
     adj 1: aware of yourself as an individual or of your own being and
            actions and thoughts; "self-conscious awareness";
            "self-conscious about their roles as guardians of the
            social values"- D.M.Potter [syn: {self-aware}]
     2: excessively and uncomfortably conscious of your appearance
        or behavior; "self-conscious teenagers"; "wondered if she
        could ever be untidy without feeling self-conscious about
        it"