Why do these girls giggle at me?

Anonymous
there is this group of girls who always giggle, sort of laugh for like 1-2 seconds whenever they see me. i had to move a table from one classroom to another for a girl and asked another girl where i should keep it. she looked at her friend who was standing, and needed the table, and both started giggling for 1-2 seconds. this made me really conscious because i thought they were laughing at me.
Why do these girls giggle at me?
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