How can a shy guy tell if a girl is interested in him?

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I'm 18yo, a fresher at university in England. My course is engineering so there aren't many girls, most girls I meet are in night clubs. But I just don't know how to tell if they're into me. I'm also shy and I feel like of I just go up to them and try dance with them then I'll be like all the other creepy guys in the club. Can somebody help me out here?
How can a shy guy tell if a girl is interested in him?
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