Where to from here?

Yeah, guys, last night I was kinda rejected by this girl, who Ive sort of been after for a few months now, even though I hardly see her. Is it wrong that I feel like an utter loser, and still do, because a. I told her when I pretty much knew I was no chance and b. I made such a big deal about it, when it's not the end of the world? Coz Im only 17, but this, admittedly, is a knew experience for me, Ive never really liked anyone before, and Im just wondering how long it will take before I truly get over her?