What should I do please help!?!?!?

OK so the drama "teacher" at my school messed up the casting so bad and i don't know what to do..The play is Peter Pan and 2 seniors that are AMAZING singers got the crocodile! and the mom....9th and 10th graders got better parts then them, what should i do it makes me really mad!! Because I KNOW for a fact that 3 of these kids only got their parts because its "special treatment" and 2 of them cant sing one of them kind of can.....I'm not jealous i didn't get a part but Im saying that if they got parts i shouldere, but my bffl and i are gonna make the most of drama, but idk what to do about the other people who are being stuck up about getting the parts they got, and 2 other peopledon'tt deserve the partstheyy got because theyaren'ttcommittedd enough to the program, but they are good at acting and singing, justaren'ttcommittedd...help!?!