Losingconfidence,
I can't say that I had the exact situation you described, but I have had my mother give me all kinds of things that I never asked for and did not want. I did return these things when I went NC.
As for the car, are you able to purchase your own vehicle? If you can, then perhaps that will be the best solution. You can then contact your parents and let them know that you no longer need their vehicle. It sounds like they are attempting to keep the strings attached. Often BPD people will manipulate a situation in which they can still have some control over the nonBPD's life. This must be very frustrating for you having a vehicle that you can't register and they will not give you the title so that you can. I would find a way to get a vehicle, thereby loosing the control they have over this situation.
Hope this helps. Rooting for you!
