Dont want to go to my formal

Urhhrhhrhhhhhh I dont want to go to my formal (basically prom for those who dont know) but i said I would go aswell its a grad/formal and ive spent alot of money on it sigh.
Im probably going to be seated at a table with people I dont like because we are in the same friendgroup (me not liking them is a recent development) Its going to be shit cause I dont like my dress anymore and I just dont think its gonna be that fun. Also my dress is slightly too big, I wanted to get it tailored but my mum said its fine and I went along with it at the time cause shes usually right. But now that im thinking about it I really should've gotten it tailored, too fucking late now cause its a week away.

Its causing me alot of unnecessary stress just thinking about it cause I feel like I have to look good cause its also my graduation. The shade of hairdye (artic fox virgin pink) I use is out of stock and theres like NO similar shade in any other brands. Yes I probably should have bought it earlier, but I had a bottle but decided to refresh my hair for my birthday n forgot to get another one. Wouldnt be a problem but I got these clip-in extensions to be able to do the hairstyle I want and already dyed them that shade! Fml!!!! Im being dramatic but fuck I just want to give up and stay home and crawl into a dark hole and stay there forever.