Diagnosed w/ Borderline Personality....do I really?

If you were legitimately diagnosed then it should be in paperwork somewhere, doentation. It's possible that your doctor said some of your behaviors point toward that without a full diagnosis but who knows. I say it's best to ask your mom about it and if that is unhelpful ask your doctor if it was true. A psychologist should already have seen the paperwork if you were diagnosed and can show it to you if need be.