The doctor told me that I might not be able to have children, what should I do?

Anonymous
I'm 21 years old and not thinking about starting my family until 27-33. Well, last week I went to my gynecology follow up appointment and the doctor looked over my test results and told me that I probably won't be able to have children in the future. I'm heartbroken because I do want to be a mother one day and I feel like it is going to be taken away from me because of my poly-cystic ovary and hormonal imbalance. I had an early period at the age of 8 and suffered with extreme menstrual cramps to this day. My gyno really has no final diagnosis about my issue but I'll have to see a specialists, not my primary care physician.

I spoke to my mother about it. Since I am the only child, and she really wants to be a grandmother one day, she was upset by the news as well. She told me that I should start asap after college by 23-24 if being a mother is very important to me, but to weigh the odds I really wanted to complete grad-school before becoming a mom and live some, that is why I would wait until 27-33. I don' t know what to do. I feel like the future of motherhood has robbed me and I'm depressed that I'll end up getting some kind of ovarian cancer like my grandma.
Updates
+1 y
Sorry if I sound wrong, but I REALLY want my own child, and I don't really want to adopt unless I have at least one of my own.
The doctor told me that I might not be able to have children, what should I do?
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