At PJ Media, I highlight a few of the differences between shy people and introverts:
There are, of course, levels of introversion. It is possible, at least in my amateur opinion, to be an introvert with certain extrovert characteristics, or vice versa. For instance, I am perfectly comfortable speaking in front of large groups of people. I love it, in fact, and don’t tire of it while I’m doing it. So I am in the peculiar situation of being more comfortable in front of crowds than I am inside of them.
I am pleased to see many fellow introverts posting in the comments section, particularly about how their introversion is something with which they are perfectly happy. One person even writes about how his introvert tendencies help him in the practice of law. As a writer, I, too, find my introversion to be a professional boon.