I'm going to tell my family I don't want to move back home
Why are you going to tell your family you don't want to move?
I plan on making my own choices without their help.
It's okay if you don't want to move back home. That is up to you.
Why should I change my life because of them?
Not wanting to move back in with your family is completely acceptable. There comes a time in your life when you realize that you are ready to live out on your own and makes all your own choices.