[cik2e]

Just to clarify a common misconception introversion != shyness. It's a matrix of shy/not shy and extravert/introvert. Introverts prefer to spend more time solo, but certainly don't have to be shy. Not shy introverts tend to be the power players in society. And there is such a thing as a shy extravert. You all probably know one or can remember them from your earlier years. The wallflowers who go to every social gathering but don't really interact with others. As a not shy introvert, I can tell you that I enjoy and need the occasional social gathering, but too much time with others gets draining.

[JoeAltmaier]

I'd go further - exhibited personality is essentially acting. You can get better at playing parts. There is probably a baseline of the 'real you' that happens when you're not 'on', and we can assert that the real you never changes.

But functionally, almost everybody can learn to exhibit personality traits that benefit them personally and 'commercially'. You can be on for the interview, the meeting, the one-on-one. And you can conserve your energy when working at your desk or at home.