Yes, Mascara. I went through a long period of time worrying that I was the problem. It was only through counselling that I understood that it really wasn't me, and that the reason I have zero friends and family, bar my DDs, my XH, and my XPILs, is because that's how I cope.
I was/am the scapegoat in my family, my sister the golden child, and having read the link on narcissistic mothers bit further back, to reconfirm what my therapist said, my mother is definitely one. A childhood like that colours not only how you feel about yourself, but also how you feel towards others - in my case a huge, huge problem with trust, combined with an insane need to please people; that made me very vulnerable to other abusive people, which has ultimately lead to pretty much total isolation.
But that complete lack of friends and family did cause me to spend a lot of time worrying that it was me who was the toxic one. I now understand that it's because I'm too scared to let anyone become even remotely close to me. My life suits me though, I'm self sufficient, I love my tiny, tiny broken little family of my DDs and I (and the XPILs and XH on the periphery, they're not allowed too close), and it really doesn't bother me that the only people I talk to are either on here, on Facebook, or when I have to go to the vets/drs/that sort of thing. I have met someone, he's fantastic, but deep down I know it won't go any further because I'd have to take a risk.