What does it mean when a girl lowers her head on the pavement?

qwer1234
What does it mean when a girl lowers her head on the pavement?

When I walk on the street toward a girl (and I don't know her/ she doesn't know me either) and the girl lowers her head or look the the side as we come closer to each other. And it's not just one girl but several ones already.

Does it mean I'm too ugly to look at? :/
What does it mean when a girl lowers her head on the pavement?
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