I'm going to move out and leave my mother alone
Why do you want her to be alone?
I'm fed up with her for some reasons. I need my space and she doesn't give it to me
I understand why you want your own space that's separate from your mom, but you should make sure she isn't left to be lonely. Your parents do a lot for you and you should try and make their lives easier.
What I do with my life is none of your business, old man. If I want to move out that should be my choice.
I understand that it's your choice to make, I'm just saying that leaving her alone entirely is mean. Why not just move out and visit her every once in a while?