Why Is My Teenager so Grumpy, Moody, and Self-Absorbed?
Briefly

Adolescence is often marked by a significant, temporary personality shift that may evoke angst, withdrawal, and self-absorption. Historically, though many adults perceive these changes as new phenomena, they have roots that stretch back thousands of years. Teenagers in ancient cultures also engaged in risky behaviors and emotional exploration, albeit in different contexts. This shift in behavior is suggested to be adaptive, preparing adolescents for the challenges of adulthood, including leaving the family structure and forming their identities.
Teenagers are known for their angst, withdrawal, and self-absorption.
Our data suggests that (on average) teens really do undergo a significant, if temporary, personality shift.
This personality shift may be an adaptation to help them leave home and strike out on their own.
Even among those historical cultures, teens would often be engaging in a lot of behavior we'd consider familiar today.
Read at Psychology Today
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