Unlike my shadow

Like my shadow, I can see your outline, your shape,
      but not the details - of your eyes and belly-button,
      for example.
Like my shadow, I can see you more clearly sometimes
      than other times.
Like my shadow, you come and you go.
Like my shadow, you are, to me, the recognition and proof       of my existence - especially when I see you.
Like my shadow, you are not me, but a part of me.
Like my shadow, you are something I've created.
Like my shadow, you are real and you exist.
But

Unlike my shadow, I cannot touch you when I reach
      for you.