Alina11, love is love no matter what colour underwear we have!
Ahhh, years ago I fell in love with a straight woman. I'm married to a man, and never thought I'd be attracted to a woman (so I don't even know if that makes me "bi" or not.) But she was something else. I felt I'd leave my husband to go live in a cardboard box with her if she asked me to! Then she broke my heart by marrying some man and they moved away and I never saw her again.
Who knows, maybe your sweet friend, like me, never thought it was possible to have romantic feelings for another girl, and she might fall in love with you during your friendship.
And if not, can you ask yourself: do you want her in your life anyway you can take her, even as "just friends", and can you be happy giving her your love platonically ... or is the pain too much for you and might it be kindest to your own heart to cut your ties with her and grieve your loss?
I don't want to make generalizations here, but I think women tend to be less threatened by romantic advances from another women than men tend to be. I think homophobia tends to occur more often among men. How do you feel about taking a risk and telling your friend how you really feel about her?
I think my sweet friend suspected I was in love with her. But it never freaked her out, because of the love we shared as friends.
I hope you find a way to be at peace with this, dear. Keep us posted if that's comfortable for you!