I don't want to go to prom anymore?
Why don't you want to go to prom?
Yes, I've lost interest in the whole thing and I'm afraid to go.
It's okay to change your mind about going to prom. You should tell your date asap, that way they can find someone else. They might be hurt if you stand them up and they have to go alone.
It's not fair. Why do I have to be afraid of proms?
I am not sure, but if you are afraid of something, you should talk to your date about it. Do not force yourself to go to prom, if you don't want to go.