I feel like my world has ended??

I have been doing terrible in school and my life really hasn't gone well in any aspect. I am just going to school to find a job to provide for my future family. I am 21yrs old and been with my guy for 3yrs. I was pressured into an abortion last july because I had no money and Im still in school and blah blah. I really wanted to keep it. Anyways, my doctor told me I could become infertile soon and/or go through Premature Ovarian Failure (menopause before age 40). They said I need to have children soon or it probably wouldn't happen. This has basically killed me. All I have wanted in life was to have children. I am so depressed. I don't feel like going to school, work, or talking to anyone. What should I do? I feel so numb to the world.