You should of really brought a used car and paid for it out of pocket. A lot of people get into this mess of things because they end up paying everything on a montly basis and then have nothing to show for it. In reality there should only be one thing that needs a loan= purchase of a home.
See if you can get into some agreement regarding the car. If you have to return it, do so and buy yourself a used one.
Save up as much money as you can. Stick to a tight budget that only allows for food and other basic nessesities such as rent, gas and lights. Sigh, turn off your internet service and work from a public library as I do. Stop buying clothes. I know that seems like a small expense, but it is not and clothes last longer than one might hope they do, so just use whatever is in your wardrobe right now and leave it at that. See if you can work overtime and really try to make your student loan payments.
Even if you have to downgrade your contract cell phone to prepaid.
By the way, I am not insulting you. This is what I actually did to pay off my first semester of college which i did so rightfully by paying out of pocket.
I would never ever get a car loan. Cars are meant to be paid in full, and as my uncle once said, "it is better to get the used one"