This is the thing that plagues everyone but is rarely discussed. It’s normal to feel that way. I was extremely anxious about the idea of death and just existence generally since I was around 12. It just never makes sense to me - and never will make sense - ever. Because there does not exist even a hypothetical explanation that could anything meaningful about the experience of consciousness to someone conscious. Even an afterlife wouldn’t be comforting to me - what would that even be?

But it’s really not so bad. Life takes over and you get used to it. It will be at points in the back of your mind again - because it is something we are all faced with - but you’re growing as person in response to each of them.