I am very, very shy, I can't approach this girl I like?

Dipsy
I know this girl for 1,5 years in school (we're both 16 years old) and I've talked to her a couple of times (not much though) irl. I also chatted with her on Facebook and asked her number.
Now I'd actually like to talk to her irl, but I'm kind of afraid. Everytime I see her I get the feeling I should talk (light conversation, and try to make her laugh), but I can't.

She is mostly always with her friends, so thats also hard to approach (if she and me would be totally alone (together) then it would be easy to talk to her, but there are other people near us, which will make it a lot harder).

Do you have any tips of talking to her?
Like what to talk about, when to talk to her etc.
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I am very, very shy, I can't approach this girl I like?
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