Sometimes. Some people get offended if I don't say "hello" to them- mostly coworkers that I see on a regular basis, so I kind of know who I should speak up to when I start my shift. Then there are times when I probably could be social, but I just stand there saying nothing... I don't know if it seems rude or not. Like tonight, I took my kids to a special function at their school. I did try to participate in that, but it felt weird seeing other parents standing around chatting amongst themselves, or with some of the teachers and administrators. I don't know if I seem rude by not joining right in or not. It almost seems like I'm invisible, or worse yet, have a sign around my neck that says "Keep away and don't bother me." Whatever I'm doing (or not doing), it's on a sub-conscious level that I'm not even aware of, and I've been doing it at least since adolescence, if not earlier.