Claudia Gray explains so beautifully what is wrong with claiming to be "not like the other girls". My favorite bit?
What I’m trying to say is, There are as many ways to be “girly” as there are girls in this world. There are always going to be people out there telling you that if you like things pop culture tells you are girly, you’re stupid, and that if you claim to like things pop culture tells you are guy stuff, you’re lying. And what I’m saying is that all these people are full of crap.
Love what you love. Be proud of it. Anybody who tells you what you “should” or “should not” like, because you’re a girl, is a big fat liar. You ARE like the other girls, like we all are, in that none of us came off some Female Assembly Line. We’re all individuals. We should all get to express it without being judged – either by pop culture or by ourselves.
But go read the whole article. It's short, straightforward, and full of truthy goodness.