How can I talk to her?

FIrst of all, im 16 and she is 17, i know im younger but im 5´11, she is 5´3 and im much more moscular than 17/18 y/o boys and i already have facial hair. Anyways so whenever i see her she always looks at me, we dont have contact or anything, but my friend talks to her little sister who is the same age as me, and my friend always tells me how great girl she is and she is even virgin as me!, altough she has had bfs, while i have never had a gf. I am really bad when it comes to girls, ways i can reach her without looking creepy?
How can I talk to her?
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