"They're probably not worth having anyway"

This quote makes me feel uncomfortable. As a young adult i'm asking myself.

When someone is about to be a parent (I think this question stick more to a man than a woman, considering the empathic link that's been biologicaly created between a child and his mother) is he really asking himself: Will they worth it ?

I mean, being a parent is a serious challenge, but a the dawn of "parenthood", are we going to ask ourself if we are ready to face this challenge ? Or if the child will worth it ?

Because to my mind, there's a huge gap between them. But i wonder how i'm going to react when the time will come. That one question makes me sick, but does it belong to our nature of self centered creature to ask something so horrible? Or does it only belongs to the worse parents. I wonder.

Dear Lesswrong's parents, how did you react back then ? Would you kindly tell me ? [I'm 19 by the way]