Squirrel, your own traits sound rather similar to my own. By any chance, did you have a, like.. really rough time through high school in terms of social acceptance? I wasn't nearly as messed up as I am now before I started going to public school, and your symptoms starting later on in life seems to fit with these circumstances.

In the jr. high, I developed some kind of social anxiety disorder as well as paranoid tendencies from constant ridicule and bullying. Basically, I started to think that everyone who talked to me was trying to make fun of me, even if they weren't. (But they always were... so.....) As a freshman in high school I was sexually harrassed so much (by some really creepy jerk and his friends who never got in trouble for it despite a few teachers knowing, but was arrested later that year for breaking into someone's house... Teachers:), that I reached a point in my life where I absolutely loathed men, boys, and the male species in general. Except maybe small children. I also developed what can only be described as a mild form of post traumatic stress disorder. I had nightmares about all kinds of crap that happened at school, and sometimes I still do. Now that I'm out of that horrible place, I prefer to spend time alone and not socialize because I have learned that social situations lead to really painful crap. I guess that makes me kind of like a lab rat avoiding a certain behavior that has always led to an electric shock in the past. But that's not all. I also like spending time by myself. Because when I'm alone, no one can annoy me! That's not to say I don't get lonely, but being alone to me is like cheese to a lab rat or something.

Basically, I have schizoid and paranoid tendencies as well. The two seem to mesh together like peanut butter and jelly if you ask me.