I am not that smart, though some may equate the trivial things I store in my head as so.
I am not that happy, though many are fooled by this smile of mine.
I am not that healthy, though my size and shape may fool many, myself included.
I am not easy to live with, there is no doubt about it.
I am not that nice, so please don't get too close to me...
Or you'll be greatly disappointed.
I am not that good a guy, really.