Sounds like you may have a case of the Craigs (one of my favorite characters from one of the later seasons of Parks and Rec)

Honestly, I feel that way too sometimes and the minute I stop smiling people ask why aren't you smiling. Sometimes I feel like people look at me thinking 'you look offended'. I don't go out much because much of what people do in public, I find offensive. That, and finding a good place to eat out on a budget is difficult. Also, sorry to hear about your difficulties interacting with people. I have been through a similar rough time in my life and still do experience a few of those same symptoms. The right people will be accepting of who you are and with time, I hope your symptoms lessen when braving into challenging social situations.