This is a psychological, biological and a partly rhetorical question. Also I am seeking some advice. So I don't know the appropriate topic to post under. Are personality traits caused by environment and bringing up or are they genetic? What part of the brain causes different people to behave differently(talking about introversion and extroversion)? Also lately many people have told me talk more, interact more and be more social. I find myself completely normal having read about introversion including Susan Cain's TEDtalk on introverts. So should I try to change myself?