Curious and confused

Hello guys. I just would like yo ask you something. All my life I was thinking that I was straight until my second year in college came. I became very attracted to a girl who is actually my closest friend in school. She admitted that she was a bisexual. However, it seems like she is not yet ready to date women. I don't know why I was attracted to her. I wanted to admit to myself that I am also a bisexual and tell her about it. Also, she is the type of person who easily gets awkward. I am worried that if I tell her, our friendship will come to an end. Another thing, I searched in the net for the different signs of attraction and I have observed some of it from her like she laughs with my corny jokes, looks at me everytime she makes a joke, goes a little but shy when we're together and her eyes got "sparks" everytime she looks at me. I dont want to assume. And yes, I'm really confused. Im not against lesbians but I kinda find it odd to date women (or my brain tells me that but my heart says "go"). And because of this feeling, I am starting to get shy everytime I'm with her. It's like, I make sure I wont do anything stupid that will make her get annoyed or disgusted. Can you please help me? Asking her is the nearest option but I hope you understand that it's very risky (when it comes to her). Thanks guys.