I Don't Want To Remember It But I Can't Not Remember It

I was seventeen and working at the mall that summer. I took my lunch break and went and sat outside in the sun. A man was standing behind a car, and walked out so I could see him, he was masturbating while he looked at me. I looked back and didn't look away until he walked back behind the car. I should have reported it but I didn't. I just didn't go sit outside to take my lunch break.