Didn't see you coming (Dean fanfic)

Have you ever wondered if you were destined to something else?
Well, I haven't. I mean, who in their right mind would choose a clumsy, sarcastic and kind of geek? Not me, for sure.
I was happy being the invisible one, the nice friend who gets invited but isn't essential. The girl who spends too much time reading or listening to music and daydreaming to notice the world she lives in.
That is, until I met the Winchester brothers. And, oh boy, did my life change. And all because a stupid prophecy and a stupid mistake.
But that's what life's about, right? Making the right mistakes?