It might also be the other way around. There are plenty of people who are really introverted, so social engagement still drains their energy, but while it’s happening, they can be/appear extroverted, charming, outgoing, sometimes at exponential extra cost.

The difference between intro- and extraversion is not simply the ability of a person to talk to others, their (perceived) “shyness” etc., but also encompasses how they regenerate, what and how much stimulation they prefer and what kind of company they need and enjoy.