Honestly, I think mine is broken. I have no desire to become a mother to a child of any sort (natural, adopted, foster, et cetera).
I also agree that the thought of becoming legally and financially responsible for anybody makes me nervous. Now, this is just me, but I don't know why anyone would want to become a parent.
If they thought about all of the bad things that could happen with being a parent... No one wants to consider these things until it is WAY too late.
This is never too far from my mind because of the horrible childhood that I had and some of the children/families I have worked with as a social worker.