I need some help...

Now, I was told that BPD is possibly genetic and also from environmental issues. My grandmother has it, I think my mom has it, and now I have it. 

This scares me... So I think I'm gonna just never have children. Ever. No pregnancy, no adoption, nothing. 

I think I'm just never gonna give birth because they'll inherit it, and I don't think I should even try adopting or anything because I was told the illness could cause me to decline mentally. I have horrible mood swings and they're dangerous. Not like I'm gonna hurt someone, but more like I'll hurt myself. I don't want someone I am going to raise to see that. My mom was and still is abusive (I no longer live with her) and so was my grandma... Am I making the right decision? Would it be a bad idea to ask my doctor if I can get my tubes tied?