feedmegin:
I struggle to accept that my non existence is going to be eternal. It literally petrifies me .
I try to imagine what it’s going to feel like but it just sends me into panic when I try .
But you do already know what it is going to feel like. It is going to feel exactly like it felt for you in your eternal non-existence before your birth.
What did that feel like? Nothing at all. That is what your future eternal non-existence is going to feel like too. Everything that was true for you then will be true for you in future. No pain, no anxiety, no worries, no nothing ...
It seems irrational to worry about future non-existence when you know exactly what it is going to be like (nothing!); your past non-existence causes you no worries, so why should your future non-existence?
The answer, of course, we know: your worry is irrational. This is why you need CBT or some other useful therapy to get you on an even keel.
We can ask what causes the irrational fear of death, of course, too. And, again, we can make a pretty good stab at the answer. Here it is: you confuse being dead with dying. The fear of dying has evolved in us all, for obvious reasons: our ancestors, lacking a fear of dying, would most likely have died (!) earlier, and the human race would itself very likely have itself died out (or perhaps more realistically, not have evolved in the first place).
That is all very interesting, but most likely does not help you, OP. You need therapy, as many pp have said.
One more pointer to the irrational nature of your fear, OP. You say, ' I don’t know how I’m ever going to enjoy life because what is there to enjoy when death is just there waiting to take us .' ...
'Death awaits, so I cannot enjoy life.' Hmm. Many have argued the contrary: 'Death awaits, so I must enjoy life as much as I possibly can.' We get to choose between the former and the latter, it seems. Me, I advocate the latter. Why? -- Simple: more fun!
Lots of art, literature about all this, of course. Maybe an alternative to therapy? (Or itself a kind of therapy? -- Not, really, but deep and interesting discussions to be had about why not.) Here's something,
Ah, fill the Cup:—what boots it to repeat
How Time is slipping underneath our Feet :
Unborn TO-MORROW, and dead YESTERDAY ,
Why fret about them if TO-DAY be sweet !