You know, the OP did not come here for a lesson in moral responsibility, he/she came for advise on the best course of action. Some of the comments expressed here is exactly why so many are put off this board, when the information herein could help so many.
To the OP, it certainly does sound like your best bet is to walk, especially since you’re not planning on staying there for the long term. By the time you’re ready to buy you’ll have saved a nice down payment, and banks will be bending over backwards to get people back into the game after all this clears. I would worry far less about any negative credit effects and worry far more about wasting any more money and time here.