Is it normal to stare at girls every detail so u can beat off to them at night

It's known as making a deposit in the visual wank bank. Later, you become reckless with your deposit and leave it just about anywhere.

normal dude

Stop staring at me.

Not normal, and could be considered a tad bit creepy

It's normal to beat off at night thinking about girls you're attracted to, but not to consciously assimilate every minor detail of their appearance in the day specifically to aid the process :| that's creepy. You must just be sat staring at them.

A: "What? Why do you keep looking at me?"
B: "I'm remembering every inch of your face so I can imagine my cum all over it later on when I'm alone, treating my meat."
A: "...."

A exits the building hastily, startled by the previous discourse, concerned for her life.

B notes down on a piece of paper "she has a dark brown freckle beside her nose" and touches himself firmly.