Worried about the future

In 2017 I was having hypothyroid issues, which has been stable for 2 years. During this time I got an ultrasound done and was told I most likely have PCOS. It was never fully diagnosed but ovaries did show more than 10 fibroids. I haven’t been checked recently. Blood work showed normal hormones and would change when I was on my period. Since starting synthroid periods have come back monthly but not as consistent as it was growing up. I’m 23 and My parents are older, my dad is 70 and my mom is in her mid to later 50s. Step dad is 60s. I have no siblings and live so far away from cousins growing up, I don’t really have a connection. Realizing we all go as we’re older, I’ve been worried who will be behind me, who will be there for me? It’s not like I have siblings that’ll create kids and have them there for me. If I could, I’d have at least 4 kids and be a younger mom and would love tons of grand babies. I’m worried with my PCOS diagnosis that I may never have kids. Also not in a relationship as I’m healing from a toxic one before. Just needed to vent and will take any advice