Hi Emi ^n.n^
As my mate and anoni have said, it is dedication to a relationship that can help determine it's success.
I was in the EXACT same boat you are in; this girl who goes to my school had a humongous crush on me, and we had lots of the same interests (music, Homestuck, rp, anime, lotsa stuff

. Not a fur, though

.)
The relationship went on for awhile, but, it just never clicked with me; I wasn't attracted to her like she was me.
In the end, and with help from friends, I decided that it would be for the better to end the relationship; I'd only hurt her more if the relationship was prolonged and it came to be that we go so long only for her to find out that I was nowhere near as interested in dating her, as she was me. She was my friend, and I really couldn't think of her otherwise.
We're still good friends, and I will say was very hard for me to end the relationship. But in the end, we both know it was for the best.
Just don't tell anyone else that you know personally, or who WOULD warn her in advance you intend to do so. That probably won't end well.
I hope this works out for you, but I gotta jet for something else; best wishes Emi ^n.n^