How can I talk to her if she's always with friends?

There's a girl I like, but it's already been 2 weeks of class and I haven't so much as spoken to her. I want to talk to her, but in class, she's always sitting next to three or four other friends, and in the halls she always walks with them and goes wherever they go. So it's impossible to get her alone. And since I've never spoken to her, if she's alone, I don't all of a sudden want to call her name and run up to her because that'll look creepy. So what should I do?

I'm recently coming off a rejection in which I missed all the "uninterested" signs for several months and now I fear that she's gonna be uninterested anyway and I'm just wasting my time.
How can I talk to her if she's always with friends?
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