Personality disorders aren't uncommon, and often are underdiagnosed (because people are so often hopping the anxiety/depression bandwagon instead, they don't look for what came first). And they suck, and often don't do well with all forms of treatment, though I've heard dialectical therapy is pretty amazing in general for all personality disorders; and was specifically developed by someone with BPD, for BPD.

Maybe something to look into; take what you like, leave what's crappy?

Also, for what it's worth, I think you're awesome.