Looking at women

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This happened recently in highschool (I'm 18)
Note that even though I'm in grade 12 I had to take a 9/10 split foods class (haven't taken any applied skills and need at least one to grad, I only had one block open and this was the only class in that block)

So,

>be in foods 9/10
>already kind of a weird autistiv loner
>put in class with kids 2-3 years younger
>talk to no one
>the boys seem to respect me because I lift and look somewhat big, but I rarely talk to any of them
>don't talk to girls either, I stare at the cute ones a lot but never a word
>one turbo stacy in gr9, let's say her name is V
>V is pretty attractive and usually wears low cut shirts
>can't help but to look, but it's cool because I'm pretty subtle
>today in class, taking a peek
>her friend alerts her in a rather loud manner "he's staring at you"
>V replies even louder without ever lifting her gaze from her phone (I know, he does it all the time)
>best friend looks at me
>activate autism.exe
>stare at her blankly until she looks away
>wait a minute and walk out of class

What the fuck? How do they know?
More importantly, how can I tell if they know?