Well, I was diagnosed about a month ago after a mental breakdown, I don't really have many doubts about the actual diagnosis but I've been looking for support groups and people who also have BPD and whenever I find them I still see myself isolated. I have a stable relationship and group of friends (tho I did have plenty of abusive relationships in the past), I'm not sexually promiscuous (quite the contrary, I identified as asexual for a long time and to this day my libido is very low) and I don't really depend on substances or relationships to keep me afloat. 

In fact, while diagnosing me, my psychiatrist said that I probably have an avoidant type of BPD, which makes me run away from things that might trigger my fear of abandonment and I don't open up or engage with anybody until I feel safe, whether that be conversations, sexual encounters or using anything that makes me lose this sense of self protection.

I still react to things irrationally sometimes (tho it had gotten better), I still need SSRIs and mood stabilizers to stay alive, I still have major paranoid thoughts of all my friends and my GF off years just waking up one day and leaving me, I've had a few attempts over the years and I'm only a year free of benzos and a month and half free of SH, still, even though I have the diagnosis, it makes me feel extremely isolated as I feel like no one really relates to me. 

I know a diagnosis is not a monolith, but sometimes I wished I could meet people who I could talk to IRL that got where I was coming from, this sub has been pretty much my only outlet and I'm really thankful for it's existence, but yeah, I feel really alone.