I can’t seem to let go

So I recently became friends with a girl, call her S, and me and S have one class together and we occasionally walk together after the class and I have developed feelings for her, although she is a year older than me. She is one of the most stunning people I have ever seen, but has shown little interest in me besides starting conversations and walking with me in the hallway, which I don’t really see as signs. So I’ve tried giving it up, multiple times, telling myself she doesn’t want me and that I should get over it quick. But every time I say I’m done, she draws me back. She will smile at me in class, or I’ll catch her staring, and I can’t help but find myself being drawn back in. So recently, after we were conversing about songs, I was talking about an artist I like, which S said she likes too. She asked what my favorite song by them was, and it turns out we both had the same favorite, and now I’m hooked again, more than before, but I will never make the move because I know she doesn’t like me. I can’t really describe it I don’t know a word for what this is, but there’s everything that wears me down and shows she doesn’t like me and I still just can’t let go. Listening to the song reminds me of her all the time and I can’t get over it, I wish she just knew how fascinating and amazing I find her.