My parents continuously remind me that I shouldn't worry about such things, feeding me with positive feelings but they do not understand how genuine my fears really are, I try really hard reasoning myself away from them but they just keep coming back, eventually I feel depersonalized until the whole cycle begins again.

They storm and interrupt my thinking processes all the time, for example : I could die in a year, I could die next month, I could die tomorrow, my parents tell me that I'm too young but what if I'm one of those exceptional cases ? it could be happen to anyone right ? I also fear the aftermath of death, I mean, I try to ponder all day on how it feels to be dead (even though it doesn't). I mean, me rotting on the ground and after a billion years, I'll still be dead, it frightens me.