Nope, I haven't. On a couple of occasions, I have said I actually have few friends, or that my upbringing didn't exactly cultivate me to have good social skills, but that's about it. Generally, people that I have average contact with, say people I meet in the course of work (and I meet multiple people on a day to day basis), they never have any idea I am a loner in real life because I act normal, friendly, and even come across as chatty sometimes. When it comes to work, I have it right down to a pat, people I meet at work are all convinced I have this great social life outside of it. It amazing how some people can believe anything.