Personality Disorders Support Group
Personality disorders form a class of mental disorders that are characterized by long-lasting rigid patterns of thought and behaviour. Personality disorders are seen by the American Psychiatric Association as an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the culture of the individual who exhibits it.

I teach and am not shy there. I can also sing in front of an entire auditorium.
But put me in a cocktail party and force me to small talk and I'm in a panic.