I have some questions:
> Do you want to have children at some point in your life? and why?
> Are there people out there who never felt the need to have children?
>Is it abnormal to not feel the desire to have kids?
>Is it a sin to say that you never want to have kids?
I have had an argument presented to me that it is wrong to say that you don't want to have children. But it is wise to limit the number of children you have (aka contraception). Because (unless you have given up your life to be with God) you are showing that you do not trust God; that you do not trust that God has a plan for your life and you want to live life in your own way.