There are so many definitions of introvert that it’s mostly lost any meaning.
Perhaps, but this sounds like what someone who doesn't know many extraverts would say.
If your default preferred way of being isn't "with other people" -- to the point where you feel anxious when you're alone for any reasonable length of time -- you're probably some flavor of introvert?
FWIW, this pretty much exactly describes an introvert. Being introverted doesn't mean you don't like socialising at all.