I've be3n diagnosed with EUPD (formerly known as Borderline PD, but its no longer used), Avoidant PD, Obsessive Compulsive PD and Schizotypal PD. I've also been diagnosed with Bipolar.
The personality disorders were diagnosed from one SCID form, and having finally being referred to specialist treatment for PDs, it seems as if I may not have them at all, but I'm still waiting for a proper diagnosis.
I did go to groups when my second was a baby (I wasn't in the MH service with DC 1, so went under the radar). I found it difficult, excruciating really, but managed to find a couple of friends I gelled with.
DC is older now, so I've reverted back into being reclusive.
It's a horrible label to have in your file. I'm still very avoidant of social situations, but you can do it.
Try lots of different baby groups. I had to try quite a few before I found one I was comfortable at. I also had a couple of friends who I'd meet up with and take the babies to the parks, etc.
Don't worry too much about socialisation, as it's as much for the mums as the babies, and they're soon at nursery, so the pressure is off.
Another thing I liked was bounce and rhyme at the library. It allowed baby to be with others and have fun, without the pressure od small talk. We also learnt the songs and actions, so did them at home too.
Good luck
Pas I edited as I haven't got my reading glasses on and missed the PD. Avoidant isn't the worse one, but I do know how scary it feels, to have to be in situations that make you uncomfortable. Think of it as the same as taking baby to have its jabs or something, not fun, but necessary. It does become easier as they grow, promise.