Some people are distracted by music, or people standing in their cone of vision, or background noise... I am simply distracted by people watching (period).
Most people have taken this thread in the wrong direction, this is not an issue of social fear, but an issue of what distracts a person. I worked in a call center for 3 years, I ran a social group in college, I am by no means afraid of people or interaction with people in any way. I simply get distracted by their presence and am easily distracted, not afraid. For some reason people watching me distracts me as much as playing music might distract someone else, and that is an issue in my own mental game. I don't care what YOU think, but your presence near the teepad is distracting. What I have an issue with is blocking out distractions, the more things going on around me, the worse I play.
If I were to pass anyone of you on this forum, you would probably not even know that I was bothered by playing through, or that I would prefer not even talking to you. You might think that I am not a good player because of my throw, but you would have no idea that I hated playing through.