AITA if I cut my sister off for copying everything I do

I’m 21 and my sister is 23. for years she’s literally copied everything I do from my hair to my clothes. last year she dyed her hair the exact same as mine and I ruined my hair bleaching it because I didn’t want to have the same hair as her, we look alike so I’ve been compared to her my entire life so I don’t want to have the same hair or clothes as her. It’s given me identity issues and I just want to be my own person. It’s always bothered me but I’ve been able to let it go because I can just wear different clothes and change my hair. but now she wants to get the exact same tattoo as me. It’s a reference to a show that she’s never even watched, she just thinks it’s cool. It really bothers me because she knows it’s my thing, everyone knows it’s my thing. And both my sisters have tattoos and I would never copy any of their tattoos because I know that their tattoos are THEIR thing. I would never copy them or try to take that from them, I think copying their tattoos would make it less special for them. Like a couple years ago I wanted a quote and my sister got a very similar quote that was very important to her and I immediately decided it was off limits and I wouldn’t get the quote I wanted because it was too similar. Now since my sister wants to copy my tattoo I genuinely don’t want to see her anymore or be her friend anymore. I’m just sick of it. I just want to be my own person and have something special to me and not have my sister copy it just because she thinks it’s cool. Would I be the asshole for cutting her off over this