I'm going to yell at my mom
What did she do to make you want to yell at her?
Whenever she pisses me off, my dad or boyfriend do not help me calm down.
You should really avoid yelling at your parents.  You say it is a problem so maybe you acknowledge that you know it is wrong.
Why I can't yell at her? When I was a kid, I used to yell at you, do you really care?
Your parents deserve your respect. It's not unusual for parents and children to be frustrated with each other but having a civil conversation is much more likely to resolve the issue than yelling.