Why are girls intimidated by me for no reason?

Sometimes at school I will just see girls have an intimidated reaction while looking at me I’m an introverted individual so I don’t really make up conversations with that many people or give eye contact. For instance I was in one of my classes and a student stopped in the classroom to talk to a teacher and I looked at her for a second just to see who was talking and she looked at me back and stopped talking. Her reaction was an awkward pause.

Why are girls intimidated by me for no reason?
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