I always knew something was wrong with my jaw or shape of my face because it never fit my body. I have pretty broad shoulders and my face is long. Always looked strange. Hopefully after surgery it will look for natural. Anyone else like this?
I've been doing amateur anthropometry lately (basically people-watching)... and there is no rhyme and reason to people's proportions. Tiny heads on huge bodies, huge heads on small bodies. Very long limbs, very short limbs, etc... Granted I live in a very multicultural city full of migrants and I've been told that it's like a zoo compared to more genetically isolated places, where everyone looks like brother and sister.
I wouldn't read too much into proportions. It's a genetic crap shoot and certainly has nothing to do with mouth breathing.
P.S. My head is huge for my body.