Why are girls always so quiet around me?

Why do girls always never say much to me? I know other guys that get girls to talk to them easily. I am generally pretty quiet and don't say anything unless I am spoke too. Like there is this girl in class who sits right behind me I tried talking to her and she was talking to me and I was walking with her but she just like left, didn't seem that into the conversation.
Why are girls always so quiet around me?
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