From someone who has been overweight since I was a child, I don't really dream as myself. I actually "met" myself once in a dream and I remember thinking how strange it was to actually see a face since most of my dream people are faceless. I might recognize who they are, but faces are rare.
I didn't recognize myself at first and when I did, I was surprised. I'm still overweight, but I'll check back when I lose more weight to see if I can ever subconsciously be able to dream as myself or not. As it is, I think it's always been so disappointing to be me that I subconsciously stay away from it.