I think it is part of the BPD package plan.
I think that because I also feel as if all relationships and friendships are artificial. No matter how close I am with someone, I have this gap between me and them that is sort of like a buffer. I am not sure if that is what you meant tho. I have never met an extrovert bigger than me (that's a cover up persona of mine) and always deal with quiet people, and I do suffer from this. I really crave real, real closeness. I deel like only my son can touch me, once he was sick and slept with me in one bed and he was touching my face and my neck while falling asleep and I thought, nobody ever touched me with such love. And if anyone will.
I went on a rant here but yeah, my opinion is, cut yourself a bit slack, this introversion is really not a flaw of character, just part of the disorder.

my opinion