Why would a group of girls stare at a guy?

This is happening with a three groups of girls at my college gym. Every time I walk by them either all of them stop talking and stare or go quiet, or one of them stares. This happens with three separate friend groups.

I don’t understand since I don’t think I’m wearing anything crazy, or have something odd about me. My friends who go to this gym don’t have this issue.

Last night I walked by a group and all 4 girls got quiet and stared as I walked by. Later on, I saw them looking at me from far away.

What could it be? This happens with more friend groups at the school gym.

Why would a group of girls stare at a guy?
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