I'm thinking of baking cookies for an event and another batch for my classmates and grandmother(birthday) and not giving them to my family
Why wouldn't you want to share the cookies with your family?
I want to hurt my mom's feelings, she is so insensitive towards me
It is cruel to purposely hurt your mom. You should be more understanding and available for your parents or they will not be available for you when you need them to be.
Mom never has time for me and it makes me so furious.
Even if you are mad at your mom, you shouldn't exclude your family. It just causes more strife.