I keep thinking about the future death of my family, what is wrong with me?!?!?

have you got brothers or sisters, i know its hard but we gota face up to the facts that our parents wont be with us one day but if you have siblings it gives you hope and it helps to talk to them. im 25 whereas you are 16, when you are older you will understand more, dont worry about death too much, just be happy and live in present moment and make most of your time with your family members. maybe it might help to ask your mother/father about how they coped when their parents died(if this is the case).