You seem like a fairly well adjusted fellow, if you've caught yourself being a jerk and want to make positive changes. Maybe you're more of a minor league egoti

You seem like a fairly well adjusted fellow, if you've caught yourself being a jerk and want to make positive changes. Maybe you're more of a minor league egotist rather than an actual DSM narcissist. If you like keeping fit, it's difficult to be that kind of a jerk if someone's beating the shit out of you on a regular basis in a dojo. Sports in general are good for people living a life of the mind (aka HN nerds); it chips away at common character defects that come from being a disembodied brain waddling around. You'll expose yourself to people from all walks of life who will give you immediate feedback if you display bad character, and it will get you moving around and make you humble. If you enjoy history and literature, maybe Plutarch's parallel lives of Alcibiades and Coriolanus; or Christopher Lasch's "Culture of Narcissism" could provide some perspective. And as someone said below, Dale Carnegie's book on winning friends and influencing people, 100 years later, is a really useful, life changing book.