In "Rabbit Is Rich" by John Updike, the protagonist experiences the dissonance between his identity and the roles he plays in life. This inner dialogue reveals a sense of artificiality; he feels like he is merely imitating what it means to be an adult rather than fully embodying it. This suggests that there is a disconnect between his authentic self and the expectations or performances society demands.

This realization prompts him to question the nature of maturity and the authenticity of his experiences. The notion that "life is playing grownup" underscores the idea that many individuals may feel trapped in societal roles, merely acting a part rather than living genuinely. Through this lens, Updike explores the complexities of adulthood, identity, and the burdens of expectation in modern life.