as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
dealership made me the secondary owner to my own car
user
you are co-signer on his car loan. you have no ownership (unless the car is titled in both names).  one option (not the best, see below) is to buy the car from him.  arrange your own financing (take over his loan or get a loan of your own to pay him for the car).  the bank(s) will help you take care of getting the title into your name.  and the bank holding the note will hold the title as well. best advice is to get with him, sell the car. take any money left after paying off the loan and use it to buy (cash purchase, not finance) a reliable, efficient, used car -- if you truly need a car at all. if you can get to work by walking, bicycling or public transit, you can save thousands per year, and perhaps use that money to start you down the road to "financial independence".  take a couple of hours and research this.  in the us, we tend to view cars as necessary, but this is not always true.  (actually, it's true less than half the time.) even if you cannot, or choose not to, live within bicycle distance of work, you can still reduce your commuting cost by not financing, and by driving a fuel efficient vehicle.  ask yourself, "would you give up your expensive vehicle if it meant retiring years earlier?"  maybe as many as ten years earlier.
assistant