I do not understand girls

Which is ironic, because I am a girl.  But I just don't understand why anyone gets enjoyment out of a dance, and especially why girls especially spend so much money on them.

A little bit of background: every year, my high school has a dance called Snowball.  It's our winter formal(so prom, only cold and everyone gets to go).  My little sister, Becca is going with her boyfriend, Will(interesting fact: when they became 'official,' he was in Poland).  So today, Becca went dress shopping.

She spent like 100 dollars on her dress, which is completely outrageous.  Firstly, the dress would have cost more than that, but it is on sale, and she only intends to wear it once.  Why would anyone spend more than 100 dollars on a dress they only intend to wear once?  Now, I can understand this for your wedding dress(since that's such a special occasion) and maybe prom dresses if I'm given the right justification, but not for Snowball.  This isn't a once in a lifetime event that she'll look back on for her entire life.  This is a winter formal that she'll be able to go to 4 times, and let's be honest: Will's a nice guy, but I don't think they're gonna be together forever.  I mean, how long do first relationships usually last?  Six months?  A year?(never been in a relationship, so I wouldn't know, but I'm guessing not that long).

Then there's the shoes.  Becca spends forty dollars on them, a pair of silver heels to go with her pink dress(I do like silver, but pink is the devils color).  I don't understand why anyone ever wears heels.  Maybe they can make you look taller, but they just seem unstable.  And uncomfortable.  At the very least, they don't seem very practical for a dance.  I mean, the point is to dance, right?  This seems like an activity during which sturdy footwear is recommended, at least if you want to avoid a sprained ankle.

Now add fifty dollars for accessories.  This is a glorified hair tie(clip, thingamabob, whatever) a bracelet(Becca tells me to look, they match the gems on her dress.  I say, "Yeah, they're both fake"), and something else I don't remember.  Though the accessories seem a bit more reasonable, since she did get 3 more items free.  Which brings me to another point of contention.  She's bringing her phone, which is of course fine, but she got it a special case to match her dress.  She already has a cow case which she loves.  I suppose it's her choice, but I don't see why you would get a case to use only once when you already have one you like.

So with the aforementioned expenses, plus things like getting her nails done, the price tag on this shopping day came out to over $300.  To put it in perspective, my dad gave her and my mom a budget of 100.  And my mom(who since we moved, has been a stay-at-home-mom) thinks that he will somehow not notice the money missing from our budget.  He has mentioned many times that due to various reasons, January is a very tight month for us.  Go figure.

To be honest, my opinion of this might be slightly colored by the fact that I don't understand dances in general.  This is because I don't like to dance.  It's not simply that I'm bad at it(though I very likely am), it's that dancing in front of others makes me very uncomfortable.  I feel awkward and strange, and not in the way I normally do when interacting with people, or even speaking in front of a crowd.  That I can deal with.  This is more akin to a panic attack.  I understand a lot of people do like it, and at least superficially their reasons for feeling so, but dances are not my cup of tea.  So its difficult to understand why someone would spend so much money for a dance.  Yet other girls I know(mostly mutual friends of Becca and I from Church) seem to understand and support Becca spending so much money on a single dance.  So are they crazy, or do I just not get it?

In contrast to Becca's day, I slept in till noon, wore the sweatsuit I got from my grandmother, and watched Netflix all day.  I think we all know who has the more fulfilling life.