Showing teeth

Normally when I smile at someone I am doing it for two reasons; because I want the other person to feel valued and because that is what I have logically worked out that you do in certain situations.

There may be an element of emotion but it is buried so deeply that I barely know it's there.
Is this natural?

(It's possible that I'm hypersensitive to the process of getting in touch with my emotions because I'm learning to develop them as an adult instead of as a child; so the reason they feel unnatural is because they are, I suppose)