I try to be more like her? Is this bad?

ok so i have a best friend and i always feel i try to be more like her. Im going into high school next year and i was trying to decide weather to do drill team or cheer and she said she was doing cheer so i said i would too and then she changed to drill team and i said i would change too. I also love her clothes and i try to buy clothes that look like hers. also she has the iphone and i want the iPhone and the same exact case she has, but only because i like it and its the only otter box case i like for the iphone 3gs. I feel like im always trying to do what she does. Is this bad?? How do i stop??