Why do my crush and her friends act weird around me?

Anonymous
I like this girl who I’m pretty sure knows I like her. I see her staring and sneaking glances at me from far away however, up close she doesn’t look at me.

Thing is her and her friends act weirdly around me when I’m walking past. Sometimes they’ll just burst out laughing when they notice me when we walk past each other in school. For example, I’ve sat opposite her and her best friend (by chance) who then started whispering to her and elbowing her to tease her.

I’m pretty sure this girl likes me but I’m slightly doubtful incase they are taking the piss out of me. Any ideas?
Why do my crush and her friends act weird around me?
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