heart problem

feeling absolutely gutted, I know doctors shouldn't give you any false hope or anything, but like why say "oh there's no promise it'll be fine in the next few yrs or not." to me?

I'm actually just so tired, I have some sort of problem with my heart valves I'm so scared if anything goes wrong, apparently its gotten better and me being my age, my cardiologist told me the worst case scenario and I wanted to break down crying. Also another reason which js upset me, the fact that I might not be able to get pregnant . It might not seem like a lot now, especially cause I'm nowhere near the age of having any kids, but like still? Like even if I don't have kids I want the OPTION to have them. Honestly wish I was someone else, I don't wanna be me. Why me with the heart problems? I feel like it won't even get better which just makes me scared, I dont wanna die of any disease related thing or a heart attack or anything, just no.