Update on sister going to prom

This topic has come up again in an argument after a few months and I repeated to them many things everybody has said in the past comments e.g. how I needed my own personal thing/space. Despite this, their opinion is the same, like how my sister did “SO well” with letting me go to prom.. I felt really alone bc of that idk whats up but my sister seems to always have the upper hand now and I cant have many things to myself anymore. Quite a useless update but mainly so I can talk to some ppl about this bc i dont really have anyone to talk to in this situation.. thanks so much