Questions: Girl's Behavior

As woman feel safer with a Bear, men might feel safer emotionally with a Rock

OK so originally this was supposed to be girls only but i messed up and put it for guys only so there is two now anyways to the point. there is this girl whenever i walk in the room she immediately puts down her head and looks at me through her arms when she thinks I dont notice additionally she dosent talk to her Friends the entire class. am I making her upset? I really do not want her to feel upset or mad or anything when she is around me or lose time with her friends but its so hard to tell and while I would ask her I tend to say something random every time i see her and run off thankfully they have a meaning with what im doing at the moment but still its really embarrassing for me to feel like im just running my mouth like a complete fool anyways long story short how do I find out why she is doing this and is she mad at me or am I just worrying for no reason whatsoever.