Like many people have reported, I also am surprised by how I "look a little different" each time that I look in the mirror, as though my features had subtly rearranged themselves in some indefinitely minor but jarringly noticeable manner. I wonder if part of this, though, has anything to do with my elaborate inner-fantasy world that occupies much of my mental space; in that world, my "self-insert" character/avatar is, well, an anthropomorphic, bipedal wolf with red eyes and white fur, which is obviously quite different from the image that I would see in a mirror.
Does anyone else who has an elaborate inner-fantasy world or who is prone to daydreaming have this dissonance between seeing the imaginary self in the mind's eyes and seeing the physical self that one sees in a mirror?
My opinion about the relative attractiveness of the image that I see in the mirror also shifts quite a bit, although I am under the impression that this is fairly normal. Sometimes, I'll look in the mirror and think, "Since when did I become a supermodel?!"; the same day, I can look at the same reflection at a later time and think, "Wow, I look hideous! Eeyuuk!" I think it depends on the lighting and the angle at which I am looking at myself. In general, I neither avoid nor am drawn to my reflection (although the doors to my bedroom closet are sliding doors whose entire outer faces are mirrors, so I am exposed to my reflection quite often).
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I am not a textbook case of any particular disorder; I am an abstract, poetic portrayal of neurovariance with which much artistic license was taken.