Do I have Asperger's?

I am the most awkward person in social situations. I've never had friends. I pour myself out way to easily and quickly to people. I can't make eye contact. I get very shaky and start twitching my leg. I don't know what to do with my body. I only like talking to people if we have a set topic to talk about. I am not good at small talk. I obsess over things and that is all I can think about. I am very sensitive to bright lights, loud noises, and touch. I get horrible grades in school but I got an almost perfect score on the SAT without studying. I find myself constantly preoccupied with small things (a zipper, a on, a small rock)... I collected small erasers when I was younger. I was obsessed. I am very hardheaded and throw temper tantrums when things don't go my way or when my routine is broken. I have to have simple foods and I have to eat small bites. I have to have comfortable clothes or I am grumpy. I often say things I don't mean and I find it hard to pick up on what other people are feeling. Things have to be set out for me (lists and specific rules). I can't complete anything open ended. I'm a "perfectionist" who never gets anything done.