I find myself explaining too often that I'm not shy, and I realize that I shouldn't be making such a fuss. It's really only a matter of semantics, and not everyone cares as much about the distinction in meaning as I do. Plus, why should it matter to me what others think? Especially when I'm not all that close to them?
The next time someone says that I'm shy, I'll remind myself that it's not important to disagree. Perhaps I'll just play along. Why resist? Why not simply agree and say that I am shy? And then maybe excuse myself because I'm too shy to continue talking with them.
Or I suppose I could just let it pass and then continue on to some other topic. It's not as if I can change anyone's mind. Still, I guess I'd rather take an interest in someone who's willing to understand my perspective as much as I'd be willing to understand theirs. But I know this is idealistic nonsense. And maybe it's not always worth the effort.