Soulmate (слэш)

based on the prompt soulmate!AU
I imagine an AU where everybody walks along in pairs. Like, everybody has a soul mate they meet and early in life and they just know it's the right person because once they touch, they can immediately feel each other's feelings and hear each other's thoughts.
Everybody except Sherlock. People find him strange for this (Anderson, Donovan) or worry for him (Mrs Hudson, Mycroft). But he likes to be alone, other people just annoy him, and what's so great about sharing your thoughts with someone, anyway?
And then he meets John, and experiences first hand just why having a soul mate is so amazing.