Social Fluttershy

The antonym of a social butterfly. A person who, due to unholy amounts of shyness, is unable to hold a conversation with someone he or she does not know well.

Kevin: The date went pretty well. If you consider we hardly talked at all and mostly stared at the food in front of us.

Michael: Come on, man! You need to be bold to get a chick!

Kevin: But Mike, you know how much of a Social Fluttershy I am!