I’m making an assumption here, but it doesn’t sound like you’re in a position financially to be able to sell the home if you could. Rough estimate puts your bring to the settlement table money to >$30,000. Can you afford this? If not, definitely walk away. Having been in that position myself in the early 90’s I know what it feels like, but you’ll be on the road to financial recovery a lot sooner than if you try to hang on.
Good luck to you, these are tough decisions to make, but it gets a lot easier after you make them.