I'm going to yell at my mom and go to film school
I see you're upset, but how is yelling at your mom going to help?
I should tell my mom that I'm going to film school because that will shut her up
You shouldn't yell are your parents. It will just further upset them. Just be honest about your plans in a civil manner and if they're unhappy, then they just will have to accept it regardless.
I don't care, I need to let off some stress and my mother is an easy target.
It sounds like you aren't being fair to your mom. If you want to better the situation, don't yell at her! Be respectful of your mom and show her that you are handling this in an adult manner.