i need your guyz help!

tell your mom your too old to be a princess.
if that doesn't work try to be a zombie princess, that's scary so it overshadows the cuteness of a princess.

Why does she want あなた to be a princess? Also what's wrong with being a princess? They are cool to be at any age. Make your mom happy and compromise with her. Tell her that あなた will put on the dress for her and then go off with your フレンズ with whatever あなた wanted to wear. She just doesn't want to see her baby grow up too fast. Do this last thing and she'll be happy forever.

its realy simple just say mom shut the fuck up i dont wonna be a princess then she'l probably get angry for a while then she'l shut up and get over it

oh,i noe ur situation,we all go throught that.so u dont like it,an ur 2 old 4 tht stuff,u hav 2 tell ur mom cuz i jst cant suffer like tht.u can kinda jst mention tht uv grown up,but try nt 2 sound ungtarefull.make her a cuppa tea,sit down an say'y dont we go and change it 4 smthin else in the shop?'i dont think she'll mind tht much 2bh,but b gentle cuz i noe moms can b so sensetive sumtimes an its very annoying :/

hope it helps good luck (:

u should tell her calmly that u want to pick ur own costume and that u do not want to be prinsess tell her what u want to be and u guys go retern it または give it to someone who needs it

Well, maybe あなた can add a twist to it. Who 発言しました あなた have to be a frilly princess? あなた could be a murdered princess または something, maybe the ghost of a princess. あなた could do a lot with it :D