According to David Elkind's theory of 'adolescent egocentrism', which characteristic of adolescence involves a teenager feeling that they are constantly under the sharp gaze and critical evaluation of others, as if acting on a stage?

David Elkind expanded on Jean Piaget's ideas of cognitive development to define adolescent egocentrism, which has two main components: the 'Imaginary Audience' and the 'Personal Fable'. The imaginary audience is the state where an adolescent believes that other people are paying attention to and evaluating their appearance, behavior, and actions just as much as they do themselves. In contrast, the 'personal fable' is the belief that one's feelings and experiences are completely unique and that one is separate and invulnerable compared to others.