I'm in 9th grade and I went to all my dances dateless. I don't think あなた should worry about dates to dances until your senior homecoming in high school. Really there are もっと見る important things あなた can be worrying about.
Dances are not a thing at school where あなた have to have dates または your a complete loner. No, it's a place to have fun and dance and do other shit. Sure, you're フレンズ have dates, but that's an optional thing, really. Even if all your フレンズ have dates, it's not the end of the world. Go with your フレンズ even if they do and hang out with them-if they're your friends, they'll hang out with あなた just as often as their date. または there's dancing with another guy there-not everyone is going with a date. または even dance alone. It's not going to hurt if あなた don't have a date, so there's no need a worry. Just have fun!