I personally avoid to think about my self with labels about what "immutable" things "I am". Like "he is tall", "he has Z skin color", "he has 9 fingers", "he has brain type X", "he is thin", etc.
I do care about what values, passions and friends I have, and I have tried to find a set that is consistent.
I do not mind if someone tells me "I am an introvert", even if I do not find it extremely interesting. But if he says "I am introvert and will be unhappy all my life because I can't change that", I can't avoid thinking that he is focusing on something that does not help.
How’d you lose the finger?!
Labels exist for a reason. Sometimes labelling a problem puts it in perspective. Sometimes they can be hurtful. It really depends on the context.
Knowing you are an introvert (aka labelling it) can help you realise what works for you and what are your boundaries.
The point is that introversion does not mean complete isolation—this is the bit every extrovert neurotypical person in this thread seems unable grasp in the slightest.
“Prefers to be alone” does not mean “cannot function socially”.