She’s not your friend — she’s someone you want to be with. That’s not friendship. It’s romance, lust — feelings you have about a love interest. Because she’s not interested in men, and you’re a man, I think you should focus that energy elsewhere. Try to find someone who wants to date you. 😉 You’ll feel more peaceful if you have some romantic success, rather than this anxiety over feelings of love for someone who’s interested in women, which makes the two of you incompatible.
Hope that helps. Let me know if you have any more questions.