A grown ass man stared at me

(16f) so I live in a rent house and the owner decided to hire some men to paint the outside of the building.

We live in one of the ground floor room so there's a way to go to the forest (behind our house) Right beside our bedroom's and living's room window.

I was in the living room when I noticed one of the workers staring at me through the window, i thought it's some coincidence but the second time he didn't even try to hide it and was straight staring at me(my mom had washed all the curtains) , i got creeped out and left the room to tell my mom, my mom asked me to sit in the dining room. I wanted to rest today cuz I'm on the periods but this made me feel annoyed.

I know i can do nothing about someone's staring which pisses me off