You have a depreciating asset, one that not only requires a monthly payment, but also licensing, insurance, maintenance, etc.
If you sell now, two things swing to your advantage. One, you stop spending money on maintaining the car, and two, instead of paying what, 5% interest on the loan, you then INVEST the car payment, making 5% ( a 10% swing on those dollars). Over 36 months, you'll spend another $28k on this car, on top of the $28k you've already spent. Spending the $10k to get out from under this seems like a good idea.
It's often harder to suck it up and terminate a bad financial decision than it is to just keep on going, hoping somehow you will come out ahead. Unfortunately, I don't see how that could happen in this case. Don't worry about it. Learn from your mistake and move on. Most of us have made mistakes of similar magnitude (ask me how I know!).