Prom ?? (read description)

So I'm in my junior year and it's prom season. I'm indecisive as to whether I should go or not on my senior year because this is my first year here and I have like 2 friends in my grade besides my sister. I don't know if it'd be worth it (average cost would be $500 if I kept spending to minimum). I don't want to regret not going later on but I don't want to spend the night bored and waste that money for nothing. 
Putting it into perspective, I could go on a nice cruise or get a round trip plane ticket for somewhere nice. (You can't compare a trip someplace to prom but in terms of cost)
And usually people rent hotels and stay someplace for the weekend after prom but I wouldn't be able to do that. 

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