I cant tell if im annoying or cant accept my situation

Im sorry but am I just like weird?!? I have a cousin who is almost 2 years younger than me so clearly we will be together 24/7 because of our age and family. But I cant have a SINGLE thing to myself!! And I dont usually say ppl are copying me and more of a "omg we r twinning" but I genuinely cant do this no more :( 

I tell her stuff about me then all of the sudden she HAS to do it or pretend to have BEEN doing it. She even gets into things she bullied me for and gets mad when I tell her even the slightest thing about it. I can say "wait I thought you hated it?" And she BURSTS INTO FLAMES, like damn.

And you can say "just dont tell her" yeah well guess what genius, I have stopped but of course whatever my mom knows her sister knows, whatever her sister knows she knows. Also when I do stuff she asks me when I did it, how I did it and ughhhhhhhh

Recently, she hasn't been copying me and we can actually go without even a mini argument so I told her how my mom has been annoying me about cutting my hair into long layers and I finally agreed but all of the sudden I get a text from my cousin and guess what, SHE GOT LONG LAYERS. I know at first I didnt want layers but the more I thought about it the more it grew on me and she knows this 🤬

Ok bye, I feel like I could've wasted my time finally making my profile but oh well to bad to sad am I right?..

BUH BYEE