A group of guys stare at me and then whisper something to each other and laugh, why?

ppl tell me I'm like a 9so I'm not ugly or anything but I'm really shy so it makes me uncomfortable..

I'm not overweight either so yeah why do guys do this

sometimes they get reply quite around me and sometimes they act like hooligans
A group of guys stare at me and then whisper something to each other and laugh, why?
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