I'm going to call my parents and sister lying pieces of shit
Is there any specific reason that makes you want to call your own parents lying pieces of shit?
Because I think they are evil people and they've always been terrible to me.
I don't feel you should call your family pieces of shit because it's inappropriate to treat family like that. They may simply don't understand you as a person and the choices you make but they are still your family and you will regret bad-mouthing them because you need them just as much as they need you.
I bet I won't regret this.
I think that you will regret it, and even if you do not that doesn't make it okay. You should never attack your own family in this way, or else you may lose them and family is a very important thing to have.