When I was an actual child, I believed that I was the kindest child to have ever existed in human history. So the reason I thought everyone---from the popular kids, to my teachers, to my own family, to my shrink---treated me like trash, is the world wasn't ready for a kind child like me. Vicious children were the norm, and were treated with utmost respect by both other kids and the adults in their lives, from what I observed. I, on the other hand, triggered hate instincts in everyone, due to them not expecting to see a kind angel in a child's body. So they abused me, hoping to make me hate my life enough to make me commit suicide. (I first learned about suicide at age 8, and became suicidal that year.) It's comparable to, although not the same, as Jesus being crucified for speaking out against the Pharisee society he found himself in.
I didn't learn about Asperger's until 2005, when I was 22. Although I did hear about autism on TV and such before then, I didn't really notice a connection between its description/symptoms and myself. I stuck to the "kindest child in human history" theory until my teens. After which point, I just thought I was weird/different.