I'm gonna scream at my mother.
She's your mother! Why would you yell at her?
Because she makes me sad.
I'm sorry to hear that your mom makes you feel sad, but yelling at her will just make the problem worse. If telling her how you feel doesn't get her to change her behavior toward you, then you could always go stay at a friend's place.
I have no friends.
Then I think you need to talk to your mother and explain to her that she is making you feel sad. She may not realize the type of impact she is having on you. Explaining it could get her to stop and to treat you better.