Please help:)?

Alright so yesterday night at the sports banquet I was named captain of the cheerleading team. I'm going to be a sopre for the 2008-2009 school year. Now some older girls on the team thought they would get captain but as you can see they didn't and they are mad at me. So what should I do?? I'm not going to give up my title but i have no idea what to do with the older girls who are going to give me problems because i'm younger and was named captain. Please help me:)