Lien on House

I made a stupid decision a couple years ago and trusted someone to help me purchase a house in Location: Kenner Louisiana. I put the down payment for the house and I used their credit to get the loan. The loan is only in their name but the house is in both. Is there a way to get my down payment back in their name sale of the house or is it lost to them? I have learned my lesson and am in the middle of buying a house only using my information.