Shyness 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.
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About Susan Cain
Susan Cain was a contemporary American writer. Susan Horowitz Cain is an American writer and lecturer. Read more on Wikipedia →