I had a great time at my high school prom. It wasn't really cataclysmically expensive, and it's a time I look back on fondly. All of my friends were there, and I had a good time dancing a lot. You could argue that there are better ways to spend a Saturday night, and you're probably right. There are a lot of Saturdays, and there are plenty of worse ways to spend them. Go down to the thrift store and pick out any old thing. Grab a friend and have a blast. You can get a date. It's not as hard as you think. (Heck, I even found one!)

Loosen up a bit, and go have a good time. If you think of it as stupid and that you won't enjoy it, you can only prove yourself right. You don't have to love high school, but you can at least make the most of it while you're there. You really don't gain anything by not endorsing or acknowledging it. Your experience can only be as good as you let it be. Discounting it by lowering your expectations and allowances will only result in your denying yourself a potentially wonderful evening. What have you got to lose?