Group membership can modify individuals' perceptions of themselves. Unable to separate their personal introspection from the ways they believe other people perceive them, teenagers may have what psychologists call an "imaginary audience", meaning that they believed that other people are just as attuned to their appearance and behavior as they are.
Alexandra Robbins, The Geeks Shall Inherit the Earth: Popularity, Quirk Theory and Why Outsiders Thrive After High School
identity, perception, reputation