Why is it that the women that WANT and can SUPPORT a baby cant have one?

There is no real answer for that, unfortunately morals and social construct and pressures have allowed teens to have without seeing the real consequences. When you can't have something all you notice is the people that do have it, and you've been dealt a bad card. Have you been to the doctors about it? Maybe you or you're partner have fertility problems, or have you looked into adoption or maybe fostering?