To me both phenomenon are about about a disconnect between a person's internal and external self. An introvert is someone whose internal feelings do not natura

To me both phenomenon are about about a disconnect between a person's internal and external self. An introvert is someone whose internal feelings do not naturally coincide with the mindset and behaviours necessary to be socially active and successful. But since they still want to be social, or at least reap the rewards that come from being social, they construct a separate external self who acts more in accordance with expectations. Extroverts do not suffer from this separation: Their internal and external selves are aligned. For many introverts, maintaining this separate external self requires an act of continuous will, hence the idea that being in social situation drains them of energy. This is especially true the less they socialise: The less practice they get, the harder it is to "play the part" of their external self and the greater the sense of disconnect between the two. Conversely, the more an introvert socialises, the more easily they can adopt and maintain the external self, and in time it can feel less like an act and more like a different facet of their character. But there will likely always be some sense of disconnection, with a feeling that the internal self is the "true" self, which perhaps only a few close friends and family have access to, and the external self, which is what most people see, is only a mask.