Though it is typical of people to do so, "shyness" is not to be confused with "introversion," nor used synonymously with it. Shyness is marked by a lack of confidence or skill in interacting with other people or participating in social activities. Introversion is just a preference for quiet and solitude (the better to introspect, of course) over noisy gatherings, a tendency to form very close friendships with a choice few people, etc. An introvert is not necessarily socially crippled.

It has even been hypothesized that one can be a shy extrovert. I would tend to agree, from observing the neuroses of my first girlfriend...