Wow. Reading through this thread, I can safely say that being really smart and gifted
one of the reasons I knew I was a nerd. I was a pretty average kid, intelligence-wise.
I guess I'd say I knew I was a nerd when it became apparent that I was socially awkward and preferred my interests (video games) over trying to impress anyone. Which is good, because I would have impressed no one!
I spent all my time wishing there were such things as devices that would allow us to play playstation games in our hands, TVs built into cars, the internet. And then when I got older I had an anime/manga phase, which morphed into a general animation/comics focus, which is where I am now.
Comparatively speaking, I am late to the Star Trek party. But better late than never!