Yeah I can relate. One of the big things about BPD I don't really see in myself a lot are the "frantic efforts to avoid real or perceived abandonment". There are times when I'm like this, but other times when I'm either completely indifferent to others, or feel negative towards them. A lot of times I have to force myself to do things with people, just because I know it's what I'm supposed to do. It may be the unstable love/hate relationships thing, but it's usually not hate, just complete indifference. I read somewhere that BPDs need to be around people constantly, and that's definitely not me. Maybe it's not true though...
One of the things about BPD I can really relate to is the chronic feelings of emptiness/boredom...maybe that's what you're describing.
You say that you don't feel any emotion, and I'd say that's more like SPD...the core of BPD is emotional instability, so that's why it would probably be hard to have both at the same time.
Here's a study on it. "With the exception of schizoid personality disorder, which occurred in only one subject, all the disorders occurred at higher rates in the group with borderline personality disorder than in the group without..."
http://ajp.psychiatryonline.org/doi/10. ... 57.12.2011