Personally I would try and pay off the parents loan they took out to get you the car, make sure I can afford making payments, insurance, gas, etc., start saving for college next year (unless you're going to spc). It works just fine right now, a huge accomplishment over the past. You should enjoy having reliable transportation, and be thankfull your parents helped you out of that mess of a civic with a decent car.
You cant afford another headache matt!