How to impress a girl who works in office of my coaching?

I am a student. I read in class 11. I go for my studies in a private coaching classes. There are only male teachers. Some girls work there. One of them has stolen my heart. As she is a staff, she works inside office. When she comes outside, she often look at me. Outside the office, there are many boys always standin there. So in their presence, I dont want to talk in front of them. Plz help me.

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