I want sex for breakfast

So, I think the school x factor is on May 12th but I still haven't really committed to a song yet, I'm pretty much screwed to be honest. I keep asking people what they think and everyone has a different opinion and when I think I finally have 1, a few people will hate it and say it sounds awful so I just don't know what to sing. I need to decide really soon though or I will be stuck singing nothing on stage, looking like a right lemon. But, how do I know what to do when everyone has such different opinions? Every song also has it's difficulties as well, whether it be breathing issues, a note issue or a bad vibrato issue. This is so hard.