Is it normal to be scared to lose the rest of my family?

I have my mom and two sisters and a dad all of which I have limited contact with, except my mom, and I am scared that I am slowly losing everyone. I have no friends in the town I live in and most of my friends have moved on of passed on. My ex boss died this week and I realized that anyone can die at any time. What do I do? I don’t like the human condition.