I'm terrified of being forgotten and leaving no trace behind (Athazagoraphobia?)

I'm overcome by a deep, paralyzing fear that after death I'll be completely forgotten. As if there will be no evidence left that "I ever existed." Even if I become a soldier and are buried in a national cemetery, I constantly think that one day even this grave will be destroyed. Perhaps it will be converted into a factory or demolished to make way for suburbs or some mall, because "land is getting more expensive, the living need space." It seems as if all traces of me will eventually be erased. I'm terrified by the thought that even my own descendants won't know who I was. I'm afraid that if no one remembers me, my entire life will be meaningless. What's that called?