I'm an introvert, too. There is nothing wrong with being an introvert; it's not something that needs to be fixed in T. It's just a place on a spectrum of personality traits.

I used to feel defective or deficient because I mistakenly equated introverted with shy...but that's not really the case. I've improved my social skills and have come to enjoy talking to people, but in most cases I can only handle a few hours of interaction at a time (except for DH and kids).

I learned the last time I did a Meyers-Brigg type test, though, that extroversion vs. introversion isreally about how you re-charge your energy--in others words, extroverts feel energized by being around other people, introverts feel energized by quiet time. That may be a little oversimplified, but it really opened my eyes and I stopped beating myself up for being unsociable or unfriendly, because that's not the case at all. As long as I honor my need to "escape" for a while, I feel so much more balanced and calm.