I'm going to crash my high school prom
Why are you choosing to crash your high school prom?
I don't have a date so why should I go to the prom if I don't have a date?
Going to prom is important to most people while they are in school so it is understandable to want to go even if you don't have tickets. But crashing one is wrong, it could get you expelled and might affect graduation.
I don't care about prom. I just want to ruin it for everyone else who does since I'm not going.
While I understand how you feel, it's wrong to ruin everyone else's prom night. Instead, you should make this night special for you by doing something that is fun for you.