Our personality is often much more flexible than we think, especially depending on the circumstances.
We often change our speech, body posture, facial expressions, and behaviors depending on the context of a situation and the people we are interacting with.
In this way, one could say we put on different “selves” or “personas” depending on who it is we are interacting with and where we are.
How you interact with a friend from college is going to be very different than how you interact with your boss. And how you interact in a classroom is going to be very different than how you interact at a party or bar.