My girlfriend is shy around my friends. Why?

Anonymous
I'm 24, my girlfriend is 21. Around me, she's fine. we can talk, laugh, joke with each other. but whenever we're around my friends, whether it be my guy friends or girls, or if I go on a double date, my girlfriend doesn't say much. And if my friends ask her a question to make conversation, it's only one sentence answers. It's like she's shy around my friends. And it makes me awkward and embarrassed that she doesn't talk. how do I get my girlfriend to come out of her shell around my friends?
My girlfriend is shy around my friends. Why?
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