I can relate. I'm a girl but I was OBSESSED with Taylor Swift back from 2009-2011. I'm glad that passed, but it felt absolutely crushing that I am just one of her millions of fans and can never get to know her personally.

All I can say is, it'll pass. It may not seem that way but like you said, this isn't love and over time, the feeling will die down. Don't contact her unnecessarily (or at all) since she already expressed her disinterest. Please respect her boundaries and don't cause anxiety to her and her family.

Good luck with getting over it!