The Difference Between Narcissism and Self-Esteem
Well this explains a lot.
I’ve always wondered why you shouldn’t trust someone who peaked in high school, and perhaps this is part of the reason.
Maybe the best people have high self-esteem, but low narcissism, and so anyone who was confident and happy in high school probably had the latter.
It would also explain why so many of them tend to be miserable later in life.