Even if your change of status request is denied, you may still be eligible to pursue a green card from within the U.S. based on marriage to a U.S. citizen. It is true that while most individuals who are here as overstays and/or have fallen out of status are ineligible to obtain permanent resident status from within the U.S., this is not the case if you are applying for permanent resident status based on marriage to a U.S. citizen.
This is generally known as the adjustment of status process and requires filing the I-130, I-485, I-765 (work permission), I-131, I-864 affidavit of support, I-693 medical etc.
You may wish to have your specific case reviewed by an experienced immigration attorney.
Andrew M. Wilson, Esq.
Serotte Reich Wilson, LLP