Does your church offer pre-marital counseling? If it does I would contact the minister and enquire about it, why???

Well hopefully it will make you BOTH see that you should not be getting married.

Failing that, I would call it off, asap...
If I were you, I would listen to my instinct and not go through with it. Ramifications of no wedding are less complex than the ramifications of a failed marriage...

I hope you find your way out of this dillemma soon.