BorderlineBrittany,
I know EXACTLY how you feel. I've been told that stuff by about everyone I know. My mom is the worst. She now knows about it and wants to help and keeps saying "yeah I'm motivated to look stuff up!" but never does... so she always ends up saying the wrong thing. She always tells me I know too much (pharm major), because I'm always looking at blogs and at new studies on treatment on Pubmed.
Have you tried telling your mom that usually BPD is caused by some sort of trauma in childhood or learned behavior? That is what got my mom to at least TRY to understand me... Because, it is mainly her doing (not really, but that's what she thought). You could also try telling her that you feel that way, and you can't help how you feel. Lol, I even went as far to show my mom like brain imaging studies to show her how it's hard for us to handle emotions.
Guilty of magical thinking: Another thing (sorry I am rambling, I don't get out much)- I think people like us are special. Normal people will never feel love like we do, never feel sadness in the depth that we do, and never feel hatred in the lengths that we do... We have the ability to feel things that others don't. You know who else had that ability? Anyone who has ever made a "difference" in this world. If no one was miserable, nothing would ever change. Try to think of this when you are miserable- it helps me to think I'm like a prophet instead of a person with a "disease".
It is a horrible, horrible feeling, but by saying to "will yourself to feel better", your mom has redirected your mood!! I don't know about you, but I'd much rather be mad than miserable (when I'm mad everyone else gets the consequences, when I'm sad I get the consequences). Get to know your triggers and it will help you to control your BPD more! (I try to focus on this sort of stuff rather than what other people say now... because everyone is gone in my life.) I hope I helped a little... :/