I basically can't talk to people. At all. First time they reply with something that doesn't make an opening for me to ask something - even if it's repeating their last question back at them - is the point where I can't come up with anything else to say, and the conversation ends. (Okay, I can sort of feed the conversation a bit if I'm talking with coworkers, but I doubt very many normal people would be interested in hearing about the client's latest weird requirements and the terrible decisions of my predecessor/whoever designed the programming language/library/OS I'm working on.) Usually permanently - beyond family, one classmate from high school and one person I met over videogames, no one ever reopens contact either.

I'm on the far end of introversion - even by the standards of a country that, according to at least one (not too reliable) source, is the most introverted in the world - but even then the feeling that there's nothing but these stillborn connections waiting for me whenever I try to break out of a solitary routine is not a good one.