'm going to cut my parents out after their reaction to my pregnancy.
Did their reaction make you mad?
I was upset by their reaction, they should know what I need
They shouldn't have made you upset in their response to you, but still, I'm not sure you want to cut them out of your life because your kids will want to have grandparents around to be with as they get older, and your parents will want to be able to be with them also.
My parents suck and don't have any idea what I want.
It might be best if you talk to them and tell them what your specific needs are rather than resigning yourself to being angry and cutting them off. They are there to support you and it's important that you give them the chance to work things out so that you can all be a family.