From "Understanding the Borderline Mother" origins of BPD:

"Therapists find that borderline patients have had one or more of the following experiences:

*Indadequate emotional support following parental abandonment through death or divorce,

*Parental abuse, emotional neglect, or chronic denigration,

* Being the 'no-good' child of a borderline mother.

(Good book, btw).. To me, it all has in common being emotionally neglected and emotionally abandoned and not getting the opportunity to learn about how the world works.

It doesn't have to be severe trauma. Just not getting what is needed to grow and be emotionally healthy leaves a person vulnerable.

I asked my therapist last visit why she said borderline applies to me and she told me her thoughts. Why not ask and see what your T says about it?