You're not going to like what I have to say, but if you listen and swallow your pride, it'll help in the long run: You're obsessed with this girl, and being obsessed with a girl is one of the best ways to destroy any chance of turning it into anything. I mean, let's see this objectively; you are thinking about her several times a day, have known her for some time, and are not in a relationship. The fact that you are on a message board asking about how to fix it, much as this may hurt, means you are almost definitely in too deep emotionally to be attractive to her. Once chances are blown, which I think they are in this case, my best advice to you is simple but far from easy: move on. It's much easier to start something new, and do it right, than to fix something broken.