After all the only information about a person that we get is from what we see and hear. It's healthier to expect and notice that a celebrity is not the same when not performing.
One example where some people have difficulty realising that celebrities are not normal is when the celebrities play The Bad Guy and people encounter them in the street and get negative responses. Whereas if they usually played The Good Guy then any equally as false positive reactions could be attributed to their normal character.
Another example from last millennia which is similar would be fans of authors expecting their idols to be erudite dinner guests, founts of wisdom, or the swashbuckling hero of their work. The author would have to point out that their novel took 12 months to create and a further 6 months of editing and they were not the same person as the lead character and that they lived with their aunt and collected roses as a hobby.
I can't find the original source, but long ago in an interview Mike Myers (comedic actor, formerly of Saturday Night Live, and a string of over-the-top movies) described himself as a "situational extrovert". If you are aware of Mike's work, you might too be surprised to learn that he's an introvert.
In layman terms, it is where you "get your energy from". For introverts they spend energy when they have to interact with lots of people and be the "center of attention". But it doesn't mean they don't like it. Or that it's bad for them. It just means they have to go and be by themselves after to recuperate.
Some people really do get stressed out with too much human interaction, just like there are people who suffer when they don’t get enough. And there’s a whole spectrum in between and going in various other directions.
E-spells
If you forget the test and just consider the ideas, it's useful
[1] https://www.psychologistworld.com/influence-personality/extr...
I actually really like most people. But I like them one on one when I can have a real conversation. I hate party chit chat because I'm terrible at it.
I have a couple friends whom I'd call extreme extroverts. One big difference between them and me is if they try to initiate talking to a stranger (at say a bar or some other reasonable location) and get rebuffed or otherwise have a bad experience, they instantly forgot about it and move on - whereas I'm still thinking about it years later.
So yeah maybe introversion is just social anxiety.
It's very common for introverts to still need time away from people they otherwise love.
I was responding to this comment, which seemed to imply that introverts don't have a problem spending time with people they like. Or, at least, they don't have a problem with it any more than non-introverts.
I'm saying that's not the case (but it's possible I misunderstood what you were saying to begin with).