As you could imagine, I know many, many writers. Some are shy, some are very outgoing. The solitary nature of the work often has one of two different effects. Either the person is shy and quiet, OR they are so full of things to say when they emerge from the cave that they're quite outgoing, chatty even. I seem to know a few extremes at either end of the spectrum.
One writer friend would rather have a root canal than speak in public or do a book signing. Another talks so much, you want to muzzle her or carry your own pair of ear plugs when she's around! Funny how the same profession can breed such opposite types. I'm somewhere in the middle - toward the outgoing end, but not a hundred percent comfortable speaking in public, although I've forced myself to do it more and more so I get over that.
What about you? Are you the silent type or the person everyone wants to gag, or somewhere in the middle?