I'm upset that my mother keeps wishing/stating that I will have kids even after I told her I don't want them.
Why did you tell her that you won't have any kids?
I just hate the idea of having kids and getting old.
It sounds like you know what you want and it is okay to not want kids. You should tell your mom how you feel so she leaves you alone.
I don't want kids and barely talk to her. I'm going to make her feel bad with screaming or I'll make her angry.
It is ok to decide to not have kids. It is however mean to yell and cause a scene if you tell her again. She should be able to accept you don't want them and respect your choices.