I need help, is she waiting for me to talk to her? What can I say? Why do I feel like this only for her?

Anonymous
Ok, so here is the problem. I never had trouble talking to a girl since I first hit puberty, but now I'm in 12th grade and most of my friends are girls and have had a few girlfriends. It comes natural to me but ever since me and this girl that I know have started to flirt via eye contact(1st started with a stair and a smile, then to glancing, finally staring at each other and her eyes are wide open but neither of us smile. I don't because I feel petrified.) and body language, It seems like all of the confidence I have just disapears every time I see her. We also have never talked for the many years I have known her. But here is what happened yesterday. We have english together and we went to a computer lab and once I took my seat, she sits behind me but off to the side so I can see her in my peripheral vision on the computer facing the other direction. As I'm working, I counted 7 times when she turned in my direction to look in her bag and taking glances at me as she dose it. But the whole time we are there she isn't working at all, so I take it she is thinking. But at the end of class I decided to try something. I took my time to pack up and took a little while and she remains seated, then as I get up she dose to all the while facing tword me completely while looking down fiddling with her phone. I stood there for a few seconds and walked closer to her and seems stiff. I wanted to talk to her badly, but I woosed out and got mad at my self. So I brushed against her arm to pass by and that's that.
I need help, is she waiting for me to talk to her? What can I say? Why do I feel like this only for her?
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