Sandvich don't an hero. :c
No but seriously, when you fight you act like a bitch. Don't turn your head away if he's hitting you, and don't back up. When you turn your head, you can't block or fight back. When you back up, that just gives him a good distance to hit you pretty damn hard. You cover your face with your arms and push against him so he doesn't have enough space to get solid hits in.
Also, you fight defensively. The only people who can fight defensively and win are people who know martial arts. Regular people like you and me would have to be on the offensive so the opponent has to block, and thus cannot hit you.