I guess God has a sense of humor, when he had a man that wanted to start his life as a priest, end up marrying a preacher.
Jonathan CainShyness is about the fear of social judgments - at a job interview or a party you might be excessively worried about what people think of you. Whereas an introvert might not feel any of those things at all, they simply have the preference to be in a quieter setting.
Jonathan Cain