I'm going to tell my mom how I feel
What do you plan to tell your mom?
I'm going to tell her that she drains all the good things out of my life.
It sounds like your mom is having quite an impact on the happiness in your life. If that's the case, there's nothing wrong with talking to her about this, but be gentle and calm in how you bring the subject up. She's still your mother and deserves to be treated with respect.
I'm not the one talking shit, she is.
I'm sorry that you are having such a difficult time with your mother. I think you are doing the right thing by having this conversation with her, but don't be rude to her when doing it. People don't respond well to hostility.