What happened when a girl saw me bow my head?

You said there was a girl in the same school who didn't know you well. You said she always lowered her head when she saw you. You don't know what she means. Actually, it's very simple. Maybe she likes you because she is too shy to look up when she sees you. Maybe you're being romantic. She didn't even notice you. You think too much. But if you like her, just talk to her face. I don't know if she likes you.