Nobody likes me because of I'm fighting with this girl.. pls read ?

hi I'm Jacky and I'm 14. so, there's this girl that has been saying to all of my friends that I'm copying her when clearly I am not! One of my "friends" that used to be her bestfriend started tell the girl I was fighting with, that I'm copying her. I just bought vans and i shopped at a certain store that SHE thinks she owns. Everyone that is friends with the girl I'm fighting with is fighting with me now!): everyone is calling me a biter and a copycat .. Just because I bought something at a store. The stores sell clothes for everyone to buy and she thinks she owns that store! Now everybody hates me because of Herr ): what do I do?.