I have always been a smiler. Sometimes people look at me strangely, "like what are you smiling about?', and generally I'm not aware that I'm smiling. My grandmother always had a smile and kindness in her eyes, and I think that is where I picked it up. Sometimes it makes a target of me, but I'm learning how to recognize those people.
I have small lips and don't have a toothy smile so you can barely tell I'm smiling anyway. It does annoy me though when people constantly tell me to smile...it's the way my face is...sorry.
You would be at home in Russia Chrissy where they regard smiles as a sign of insincerity, but laugh a lot, especially after a few vodkas