How is narrating his journey through Hell a way for Dante to confess his personal “sins”?

Paper details:

papers should be double space only, typed with Times New Roman font, 12 point (not 14-18 point font), and, one-inch margin all around (not two or three inch-margins). A double-spaced page contains roughly 22 lines. Don’t worry about the Bibliography page. I will do it. The 5 pages don’t include the Bibliography page.