I'm like that about people's thighs. I compare the size of different people's thigh size to mine. :P It's because I am insecure about my weight, and I have thunder thighs. So yeah. xD I also do the same thing with people's hips. My hips are wider than most people's, and I always feel like a freak when I'm staring at someone's hips or thighs admiring how skinny they are. XD
I feel the same way. I think feet overall are disgusting though...I just hate the way they're shaped. But I most definitely never judge a person by their feet considering mine are repulsive. My big toe has this like thing on the side of it. It doesn't look deformed or like anything's growing on it. Just....You know how most people's big toe is like striaight? Mine goes straight out, then it slants a little bit. So...Nevermind. It's really hard to explain, but I get it from my dad. And my second toe is longer than my big toe. ]:
I used to have a thing about people seeing my feet. It got so bad that I would wear tennis shoes to go to the beach. Tennis shoes and a swim suit look pretty weird. XD