When did you realize you were a nerd? I'm pretty sure I burst out of the womb quibbling about Star Wars trivia, because I don't really remember not being a nerd or some sudden epiphany that I was one. I don't remember not watching Star Wars; I had a Wickett teddy bear and an R2-D2 toybox. I was majorly into fantasy stuff like Red Sonja and Conan and bad Hercules movies (though one could argue that was the gayness coming out). Star Trek: The Next Generation started when I was five and I was hooked instantly and played Enterprise all the time. I was just a little nerdy kid.
I never stood a chance, really; my dad was a Trekkie from TOS days and I'm distressingly like him, so it was inevitable. (Though I didn't get his Western fixation.)