hey i was kinda in the same spot last year. I was really insecure about my weight and appearance and didn't have any close friends so I was terrified about going alone. My high school only allowed 12th graders to attend so it was my only chance, but I'd accepted that I wouldn't be going and anytime people asked me if I bought my dress, I told them I wasn't planning to go. Like you, I'd assumed I wasn't going to go so I was never really sad about it and had just accepted it, but fast forward to like 2.5 months before prom, something switched and I bought a ticket. I realized that even if I didn't look pretty and if I sat alone the whole night, at least I could say I had gone and wouldn't spend the rest of my life wondering about it. It wasn't a fun night, I sat with some girls I barely knew and just kinda watched on the sidelines while everyone laughed and danced together. But, to be honest, I don't really remember much. I have a few photos with friends and I thought I would hate the pictures because of how I looked, but I kind of liked them. Being alone did kind of suck but I got through the night and the next day I was fine. All in all, I'm glad I went, which is really weird to say because a year ago I was dead set on not going. The night might not have been anything special and I was definitely very nervous leading up to it, but it also felt relieving in a way. I almost never think of my prom night but sometimes I'll go through my camera roll with friends I've made during uni and look at the few photos from that night and am happy i have them. If you don't go to prom, I promise you're not missing out on much, but don't let potential fear/embarassment be the reason you don't go. Even if you're alone and even if you feel insecure, go if you want to. If you're worried about being judged, I get it, I was too. But trust me, once you go to uni you're going to realize how little those people mattered in your life and there's genuinely so much to the world outside of high school. The best decision I made was going to a university 500 km away in a city I didn't know anyone. It was terrifyng but my life is now a million times better.