Welcome Unhappily Married
Assuming that you want to remain irregular, or better yet, inactive:
You can divorce without getting DFd...except neither of you will be free to remarry in the eyes of the congregation.
DO NOT go get laid outside the marriage just to force her into divorcing you. That will end up in DFing and alimony/child support. I've known a couple of people who went this route and it backfired. Not worth it.
Just get seperated, fade from the religion and then when you're off the radar and most have forgotten you, file for divorce. Then when your legally free, go about your life on your terms. If you should strike up another relationship before the divorce is final, be very, very discreet. Better yet, keep your pants zipped until it all plays out.