hey. yeah, i'd imagine that a lot of that is probably a function of the particular scene you are in. the nightclubbing / bar scene can be really very superficial and overly concerned about appearances for people of ALL sexual orientations.
are there other aspects to the scene in your area?
could it be... (i ask this very gently) that it is less about thinness and more about outgoingness and enthusiasm and stuff like that? i'm wondering whether this issue goes deeper than the weight but that the weight might be your symbol for those other deeper issues...