I'm thinking of cutting my mother out of my life
Why do you want your mother out of your life.
She's always overprotective and she never supports me when I'm in trouble.
So it seems like you feel like you're getting shafted on two ends with your mother. You don't owe her anything and could definitely end the relationship if that's what you really want. You should try to talk with her before and explain how you feel, because this choice would likely cause your mother a lot of emotional pain.
My mom is a fucking bitch.
It sounds unrepairable at this point, but you can't give up on her. Try to express to her how she makes you feel and take some time to get to know her reasons. If she can't be reasoned with, then the only choice is to stay away from her.