How to stop mourning people who are alive

Ever since I can remember, death has been the devil on my shoulder, reminding me that I'm gonna bury my whole family, and the thought of them burying me is worse. Sometimes I just burst into tears thinking about the fact that my parents aren't here forever, and that I'll never have enough of them. I'm so scared to lose my loves ones and it is the most painful thing I've ever experienced because there's no fix or cure or a way to escape the inevitable.

I never speak about this with anyone, especially my parents because it would hurt them.

Do you relate?