way to go,
kryoptic!
yeah, it feels bad now, but once you've gone ahead and declared your feelings for someone, it makes it a lot easier to do in the future.
i'm sorry she wants to keep the friendship in a static state, but that certainly does not seem a bad thing; if she's a good friend, she'll continue to be a good friend, and having someone to chill with is never a bad thing.
don't let her get all weird on you now, what with her knowing that you like her. you'll find that your feelings for her will probably change, given that (at this point) they're unreciprocated. she, however, may feel a bit awkward around you because she knows you have "more than friend" feelings. simply tell her that you still consider your intentions as though of a friend, you were merely interested in exploring a possibility. it should put her to ease, and allow you to continue developing your friendship.