In a room full of introverts, I'm the guy in the corner. Well, at programmer meetups I am, anyway. Shy and introverted are two different things, but in either case it extends to electronic interactions as much as it does to person to person interactions. Plus, I think an person who makes presentations may be shy, but they are still outgoing by most standards.
Actually making presentations changes things a lot for a person. I've seen people who spoke so softly you could barely hear them improve dramatically with some practice. Try joining Toastmasters.
