Well, whattaya know?

Does anybody really know that they know stuff, that they can do stuff? Because it turns out that I typically just "can do" things, and I don't know that they're special skills until somebody goes wide-eyed and mentions that nobody else can do the same stuff. I mean, I sit there and say, "but... it's easy. It's not hard. Anybody could do it."

Is that normal? Or do most people actually know that they have talents? I wonder what that would be like.