The phrasing of that one is weird. I tend to feel alien in a group of strangers, but that's because I'm in a group of strangers. I don't know what it means to be "appreciated" by one of those present.

I rather dislike most usages of the "introvert" label. It usually seems like people either trying to dress up their insecurities or personal weaknesses (in this case, poor social skills) as an innate and unproblematic difference in temperament, or an attempt to make oneself feel better by giving themselves a nice label that aids them in their endless efforts to ponder their identity, like a self-absorbed teenager. Which, now that I mention it, is what most of the kind of people I'm thinking about probably are.

I enjoy being alone, and reading books, and that kind of thing, but I'd find self-application of the label "introvert" cringeworthy. And anyway, I also very much enjoy being around people, even if I'm fairly bad at small-talk most of the time.

I also used to be very shy and awkward around people, and I'm (usually) not anymore because I made an effort to get better at socialising.

"Introversion" and "extroversion" seem like just another part of the attempt to have increasingly specific terms for every component of selfhood, that people can than apply to themselves to make themselves feel better about their shortcomings or because of supposed superior connotations (like the general assumption that introverts are "smarter" than extroverts). It's like people diagnosing themselves with autism because they play video games all day and hate to talk to people.

Edit: This kind of thing annoys me.