Is it normal that i masturbate to girls snapchat posts?

Hello, iam a teen and I like to masturbate to girls' snapchat stories, I usually jack off while playing the snaps on a loop lol! anyway these are just really hot girls from school, They are a bit more than just acquaintences, I sit to one of these girls in Science class and barely ever talk to her, but she posts so much "material" that I can not resist but to masturbate to. It feels MUCH better than porn, and it is simply amazing because I actually know the person in real life