So I STILL don't know if I'm bi or straight?!?

So I already posted a similar question about my sexuality and I talked about this girl, and I'll just break down the story. She's a les, and dresses like a boy and has a crew cut. She's absolutely stunning, both in guy form and probably as a girl, and she likes someone else as she's told me (were really close, really good friends) in another school. It's a long story but over the weeks I've become what i think is being attracted to her. She makes me smile, I love being in her presence. Some pointed out that means I love her as a friend. But I thought about it, and the next day I realized I really wanted to touch her. To hug her. To kiss her, but nothing much more than that. I love how she looks. I love her eyes. I love her laugh. AGH! It's so frustrating. And lately she's been flirting, just slightly; leaving her arm on my desk, looking at me every few minutes, talking to me more than usual. And I'm so confused because I like her but I'm kind of scared to be bi because of how society accepts such people. And am I even bi?! Please help.:(