It blows being upside down on a vehicle; I know I have been there when I was younger. Here is three options you might look into:

1. Look at trading it off on an older and even less popular used car. I traded a '92 fully loaded extended cab Silverado for a '87 six cylinder base Bronco. Fortunately I got a good reliable vehicle but you can end up even in worse shape if you get a car that has issues.
2. The option is trade it off for lease vehicle, at least with a lease vehicle you will have a car that is still under warranty.
3. Try a consolidation loan and include your car if you can swing the payments.

I hope it works out for you.