It might be worth noting that people aren't necessarily either/or. I found myself not being quick on my feet in conversations at all when I was in my teens or so, but I believe I learned some of that as well when I learned more social skills in my 20's.

I'm more of a reader as well, but I'd hate to classify myself as strictly either, as it may sometimes be difficult to distinguish between a strong innate orientation and learned skills (or lack thereof).

I don't necessarily like the idea of people categorizing themselves too much since I've seen (especially young) people think of aspects like that as fundamental to themselves, only to discover that they and their skills were more flexible than they thought.

I'm not trying to tell you how to view that aspect of yourself, as you certainly know it better yourself, but I wanted to offer another perspective for the sake of other people reading into it.