Debate team embarassment

I wasn't involved in any extra-curreicular activities and I went to Catholic school. One of the elderly nuns was concerned about that and she wanted me to participate in some school activity. I didn't have any interest in that. A few of my friends were on the debate team. So I joined so I can hang with my friend. I became a debate team alternate, I'd be there in case someone got sick. I never expected to take part in a debate. My best friend got sick and needed an operation adn I had to take her place on the debate team at the last minute. The topics were assigned and the teams had debate back and forth. My topic was air pollution. I was completely unprepared. I didn't know or care anything about the debates. She gave me all of her cards before she went to the hospital then we went to the debate. I didn't know what was on the cards. It turns out that everyone could argue in great detail and I was unprepared. It was my turn and started to hem and haw, just trying to make sense with what was on the cards. I looked up and the debate team judges were laughing at me. I didn't blame them...but it was really demoralizing. We lost the debate and I quit the team, but everyone tried to get me to stay. But all I could think of were those laughing judges so I ended up quitting and later got the record for school hookey.