If this is truly a P2P mortgage, you should have received a 1098. Have you checked with the P2P network company and asked them why you haven't received a 1098? Maybe it's a downloaded form only. Also a lien on your home may not qualify your loan as secured. I believe there needs to be a trust deed or similar document that allows the lender to foreclose on the property.
Again, I am not a tax expert. I am just bringing up things to consider.
