In addition to learning to "do it because that's what everyone does", when growing up we have to get responses from those around us. If we don't get any sense of feelings from those around us, we cannot learn how to understand or employ our own. Learning emotional behavior is not just "learning" like one is in school (the watching what other people do and then copying it) but interacting with others; if we don't have others we can interact with in a good way, we don't learn the complete interaction package.

I would talk to your doctor, maybe have him refer you to a therapist and see what you can see (if you want).