Well, first of all, keep your stuff that you need, out of your car, particularly garage door openers etc.

Presuming the car is not worth as much as you owe, you still might try to do a short sale, get your best offer on craigslist, take it to the lender, which they’ll probably reject, & then when they sell it for less at auction, they should only be able to come after you for the difference between the offer they rejected and the sale, not the actual deficiency.

If the deficiency is so large there is no way to resolve it, and you have other debts as well, bankruptcy is often the next step.