Guys, What does it mean when a group of guys go quiet when you walk past?

This happens quite often and it makes me feel really awkward. They could be talking loudly and then go completely silent. It happens even if I'm wearing a jacket and jeans so I don't think they're checking me out. Am I looking too much into it? It just makes me so self-conscious.
Guys, What does it mean when a group of guys go quiet when you walk past?
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