Firstly, never feel worthless or unhappy just because of some biological condition that restricts you to give birth. Giving birth is not an obligation for a woman. Women aren't baby making machines. We are humans too, our purpose in life should not wholly revolve around or depend upon giving birth but to earn for ourselves and our loved ones such that we stay independent and do not feel the need to rely on anyone for our personal needs and have some self respect.
Secondly, if people really do want a child, why do they not adopt ? There are several kids abandoned, in the streets, in the orphanage and still no one feels to adopt them. I'm not saying to adopt them for the sake of charity, if you feel the need of a child's presence in your life, why are you still choosy ?