Well you've got two options:

Option 1 is to toughen it out, do the two years, file I-751 jointly, get your 10 year green card and then ditch her.

Option 2 is to ditch her now and seek a waiver filing. There's basically 3 grounds you can seek it under:
1. You entered the marriage in good faith, it didn't work out, and you divorced.
2. You entered the marriage in good faith, but suffered abuse during it (VAWA filing).
3. Your removal from US would cause you extreme hardship.