How do I cope with school embarrasment?

I'm in the 8th grade and on thursday I got in a fight with this kid who was in my grade but smaller than me. The winner of the fight was unclear so we decided to meet afterschool. I waslookin at him with anger in cl (because he's so annoying), and I noticed that he was kinda built and muscular. So I was walking towards him and I noticed he had alot of friends around him, mainly preps. So I told myself, if I lose to this little kid, everyone will be a wittness and everyone is gonna make fun of me. So I dicthed. I still hate myself for doing so. I have P.E. first period so I'm afraid he's gonna call me out infront of everybody in bleachers in P.E. I don't know if he didn't remember about the fight, he looked pretty distracted with all of his annoying prep friends. He might have been talking about how he was gonna squish my head. So what should I say if he calls me out? SHould I make up some lame excuse on how I couldn't make it?