I'm going to cut my brother out of my life
How come you would consider cutting him out of your life.
I think he's been holding me back from developing myself.
I can understand your feelings about trying to develop yourself. It's wrong to cut a family member out of your life. You should try talking to him and letting him know how you are feeling.
It's easy for you to say, you don't have a brother like mine. He is obnoxious. I don't feel like it is possible for me to be sane and keep my brother in my life at the same time.
Evenstill, I think most families have a family member like that. It is simple,  just avoid being around him as much as possible without cutting him out entirely in case you need each other eventually.