I think you plagiarized your paper. I'll give you your two options:
1) Admit plagiarism. Earn an FA for this course. Case closed.
2) Deny plagiarism. We sit together and you convince me that you actually wrote it. Bare in mind that once you deny plagiarism but I actually prove you wrong, an FA is no longer the only result. If we discuss the paper and you fail to prove it to be yours, I report you to the dean and you suffer the consequences, which might entail your failure in the whole term.
Let me know what action you want to take.
