my sister's obsession ruined my room

ok so my older sis is obsessed with all things sparkly and fancy. like legit it’s a problem how many blingy stickers she has plastered all over her walls and books. but this week she decided to ‘help’ me by putting glitter tape around all my shelves, posters, and even my closet door. my room looks like some disco ball exploded in there. i swear to god it’s so bad i can’t concentrate on homework anymore bc my eyes are just drawn to the shimmering garbage. plus now she has this thing where if something isn’t perfectly aligned with her stickers or glitter strips, it needs to be ‘fixed’ or moved immediately. like yesterday i had a book propped up against my lamp and boom she’s in here straightening everything out. i know she means well but seriously this is driving me nuts. i’ve tried talking to her about how it makes my space look childish and unorganized, but she just rolls her eyes at me or acts like i’m being petty. i don’t want to be the asshole who tells my parents about it because that would make things worse between us. what am i supposed to do? i guess i could start putting up posters over all the glitter junk, but honestly now i just feel defeated and annoyed every time i walk in here. i’m stuck in this weird purgatory where i’m too old for my room looking like a fairy princess den but my sis won’t listen to me. sigh