I plan to let my mother raise my baby when I leave home.
That seems strange. What does your mom think about this?
She says that she needs to take good care of the baby.
It is good to do what is good for your children even if it is not you raising them. But it is understandable if your child does not understand and will be hurt that you didn't keep them.
You don't get it. I'm going to do what I want with my life and with my child.
You can do what you want but it is your child that you are abandoning. You might regret not taking care of your own child but it will be too late and your child will want nothing to do with you.