In love with my best friend

my friend and i have been friends since the first grade now we are gong into the tenth grade. She was the person that i told everything i even came out to her before my parents, she was my rock when my life got to difficult to handle alone, but as the years passed and i got older i realized that i loved young women they were and are my bread and butter i could never imagine myself with a man. But as i got older i also realized that i wasn't interested in only having a friendship with her i wanted for her to be with me, but sadly she's straight and i told her that i was in love with her which she just told me that she doesn't like girls and i unterstood that and just being her friend was better than losing her completely and that worked for awhile until it didn't which brings us to now in which i have to make the decision to stay her friend and risk never falling love with another person until i finish high school and drift apart natrally but thats in three years or i can change my whole life and stop being close to her at all because it kills me to see her with other people or talking about her boyfriend but i think i've already made the decision i just need to get some lady balls and tell her. HOW AM I GOING TO DO THAT!!!!!! :(