I guess my current strategy for handling social dynamics (as an introvert) is not doing me any favours. I usually get quite close (in a professional context) to 1-3 co-workers and have most of my interaction at work with them. All others I keep at a distance. Then again, social interactions with people I don't know very well is really draining for me, and I can't spend that kind of energy at work.
I've always done this, though. I have a few friends that are very close, that I can count on for life, even if I don't "nurture" the relationships continuously. But making new friends is really hard.
Thanks for the advice, though.