I get really on edge and freeze up, clench my fists, grit my teeth, screw up my nose etc when people hug me, even my parents. I also just seem to have this emotional coldness towards everyone. Can't empathize with them or anything. It adds on to how I feel when guys express interest in me. I identify as asexual, and it just gets on my nerves when people try to get close to me. I can't even tell my family that I love them, because I don't feel love/affection towards anyone, and it just annoys me when people ask if I'm alright, because I apparently look miserable but I'm actually happy/calm/anything but depressed. Can't help that I have a deadpan expression most of the time.

It helps to kind of force yourself to bear it...it's not really a socially acceptable thing in certain situations :(
Basically its okay to feel cold towards everyone, if that's the way you are naturally and prefer to be isolated. But you may hurt some people close to you with that coldness, and you should consider the effect you're having on the feelings of important people like your parents. It's okay not to love them, as long as you don't hate them!