Am I turning into my boyfriend?

Okay so my sister is saying I am turning into my boyfriend because I bought a pair of Vans. I can't lie I kind of have a history of "morphing" into my boyfriends, but that was a year and a half ago, and since then I've been single up till now. I really focused on myself and found who I was and what I like. I'm 17 now and I have been reuring my sister I am most definitely not my boyfriend!!! So where do the Vans come in? My boyfriend has like five pairs and I decided to buy a pair for myself because his are so comfortable and I love them. Is that so wrong?? Oh and I listen to his music now. That's a big crime too. So what do you think? Is what I'm doing wrong? What, I can't be impacted by anyone??? Even if it's as simple as buying a pair of shoes? Please help...how do I convince my sister?? Thanks!