Not ready

Sometimes I feel like I'm not ready to be a mother, I feel like I'm too young for children and I feel like there were tons of other things I wanted to do before I became ready to become a mother. In the beginning it was cute"aww I'm pregnant " but now it's becoming real and I don't feel ready. Obviously there is no turning back now but it scares me to realize I will no longer have freedom and it won't just be me anymore it will be me and my baby boy. I feel like my whole life is about to be different forever I'm ultimately not ready for the responsibility. I just don't know how I will change my mind set.