I am going to assume that you have some working knowledge of the Closed Sicilian. If you don 't please let me know.
Your first suboptimal move was 3.f4. The optimal move is 3.Nf3.
My first question to you is, 8...c4, is it a pawn sac by Black or not? If it is a pawn sac is it sound?
Please post variations that show you understand what Black is threatening after the move 8...c4.
OK, my 1490 vs his 2240, I didn't expect a result. But mostly I have some idea after a game where the rot set in.
I thought I played OK, and just got crushed...