The Rewards of Being Shy 
"Because shy children appear to be more sensitive to winning and losing, they may experience emotions more strongly than others, putting them at risk for emotional disorders such as anxiety and depression. On the flip side, shy children may experience positive emotions such as success very strongly, helping them succeed, Knutson says."
http://sciencenow.sciencemag.org/cgi/content/full/2006/613/3
"Because shy children appear to be more sensitive to winning and losing, they may experience emotions more strongly than others, putting them at risk for emotional disorders such as anxiety and depression. On the flip side, shy children may experience positive emotions such as success very strongly, helping them succeed, Knutson says."
http://sciencenow.sciencemag.org/cgi/content/full/2006/613/3
