Personal fable

The Personal Fable is a belief held by many adolescents telling them that they are special and unique, so much so that none of life's difficulties or problems will affect them regardless of their behavior.

Personal fable: a potential explanation for risk-taking behavior ...
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According to Alberts, Elkind, and Ginsberg the personal fable "is the corollary to the imaginary audience. Thinking of himself or herself as the center of attention, the adolescent comes to believe that it is because he or she is special and unique.” Wikipedia