Why is she nervous and awkward around me?

This girl at my college stares from far away all the time, but when I visited our college coffee shop where she works, she took my order and wouldn’t make eye contact like at all. She was really fidgety and messed up my order. She gave me the wrong size and this shop always asks for your name so when your order is ready they can give it to you. She knew my name and how to spell it…..

Why is she nervous and awkward around me?
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