Is it normal that i hated my prom?

I hated my prom.

Don't get me wrong, I liked my high school years (for the most part) and I have quite a few friends. But after we get back from pictures and actually go in, I couldn't stand it. Looking around and being there just made me angry. I didn't want to talk to anyone (which is strange because people usually see me as the "life of the party").

My date to prom was a really good friend of mine. Lets call her friend A. So friend A is really nice and funny and pretty smart. I get along with her very well but she's not very in shape. And by that I mean she is clinically obese. I've been trying to get her to do small things every once in a while to start her on better exercising habits but she shows no motivation for it. Friend A is also pretty much in love with me, and I asked her to go with me because she was really excited for prom and I didn't want her to end up going alone.

Anyway, then there's friend B. I've been friends with her for about the same amount of time and we also get along very well and she's also smart. The big difference now is that friend B is a dancer. And absolutely sexy. And friend B's parents are also both music teachers at my high school and I interact with them a lot. A few months prior however, I didn't think so and for some reason or another I rejected her.

Whenever people asked me what was wrong during prom, I just shrugged them off and told them it was the atmosphere. I made a huge mistake. Is that normal?