Based on the facts you have presented, you are subject to deportation at this point due to the overstay. Further, if you leave the U.S. you are subject to a ten-year bar from reentering as you have accrued over one-year of unlawful presence. The primary avenue for obtaining permanent resident status for you is through marriage to a U.S. citizen. However, you cannot marry this person solely for an immigration purpose.
Consult with an immigration attorney as soon as possible.
Subject to the caveats previously mentioned, processing time varies from place to place, but in Boston, an approvable marriage case can be adjudicated in 4-8 months.