Let's see...I'm sure some of these are repeats, or just idiosyncrasies of mine, but we shall see!
- you know full well you are capable of driving a car, but the thought of multitasking 20 processes at once, while being responsible for your life and those of everyone on the road gets the anxiety motor running. Either way, flying, trains, and walking are all safer anyway.
- To get out of your head before bed, you run through the events of the day quickly to try and analyze "how you did", then retreat into a daydream about your current obsession or made-up world just so you don't have hyperactive thoughts running around in your head
- you're too afraid to talk to people about "how you feel", worries and the like, so you imagine talking to them in your head, and try to imitate their reactions as best you can
- for a while, you worried about being a sociopath because how worried that would make your family and friends. Then you realized that couldn't be it because of how much you worried about them
- best feeling in the world to just stand under the open sky and look up and just think real hard at the universe
- social taunting from "peers" never really bothered me because I never saw them as peers - teachers and the Internet were much more deserving of respect
- teaching others is both challenging due to the social aspect and thinking in a different way, but also rewarding because I can see how others process problems and try to explain step by step how cool what we're doing is, in the grand scheme of things
- you want to be immortal not because of how much effect you could have on the world or to take care of your descendants, but because having a stable viewpoint on the progress of history would have been very useful, and because you want to see what cool things will happen, technologically and socially. Also you want to go to space, dammit.
- you didn't want to be something normal, growing up (astrogeophysicist since I was 6, here. Got to university riding that boat, discovered geochem is much more in line with my interests)
- you couldn't stop reading a book, for sleep, for food, for anything. If I started a book (life is busier now than high school), I would expect to buy the sequel the next day - and these were 300+ page books (mostly fantasy and sci-fi, of course). How can I sleep if my brain is imagining where they were going next, anyway? Just need to finish it, not going to sleep anyway!
- I'm happy as a clam to invite people to my apartment, as long as I can go off and do my own thing while they're occupied with my full stock of games. They've gotten used to it! I still dislike going to other people's houses because there is no exit and I have to perform full time.
- you get random nice people ask "are you okay?", or say "you're awesome, stop looking so sad!"...apparently my neutral face looks depressed or angry, when really I'm happy as a clam just thinking to myself without needing to look like anything in particular. Luckily it also acts as nice-people radar, and hell, even when I'm perfectly content, it's still nice to hear!
Okay, stopping now though there are many, many more.