Oh, death is just a recycling of resources. Like, if it helps, think about the universe in terms of its smallest building blocks and you'll realize your perception of yourself is really just a necessity of like the functioning of consciousness. At the smallest level we and the universe are one totally big mass of matter so death is important fertilizer. If you are religious you can apply a similar concept in more ethereal terms, but that life seems too fixated on the after instead of the now so it's not for me. I'm also an adult with a terminal illness so I see the universe as a place where bad things happen for no reason, and they'll happen at your most vulnerable and they will take your loved ones away in a blink. Dying also generally involves body shock; autonomous involuntary efforts by your body to revive you and organ failure is extremely painful; neurological damage if you do get revived because unlike on TV, you do receive brain damage, a broken spine, broken ribs, and it's unlikely you'll come back as you were, or all of that; and in general, there is this misconception dying is peaceful because death is silent, but doctors and mortuary staff and chaplains usually use that diction because um, you would have to be super mean to deny someone the courtesy of positive coping skills.
The point of me saying this isn't to be the edgy young mid-20s English/Lit/Creative Writing high school teacher girl I am (well, was, muscular dystrophy cut my career short, but I'm in the top percentile of people with Duchennes' so I'll probably survive a good decade or more past 25) but it's quality, not quantity, the impression you leave on the friends and family and significant others you love, not what the world says you accomplish that makes life whole--which brings me to my advice for you OP.
It's not being prepared for death that you should fixate on, because we're rarely ready and you have a right to feel emotions about it. Don't try to turn that off, because believe me, I tried that when my brother died and I tried to turn off empathy my whole life because it overwhelmed me and I had to pick myself back up and now I'm still a recovering personality disorder minefield. When facing or coping with death, feel. Let it sober you, let it make you covet memories, and don't take loss from it, but celebrate the life it ended, because one day your experiences will carry you to sleep, and it's then the visceral terror of dying fades to peace and acceptance.
It's what you take from death and what mortality makes you care about and cherish that much more that will take the fear away, and whether you believe in an afterlife or that you hallucinate, because in that moment it's real time for you and you'll never know your life flashing before your eyes has ended. So like, mega fill your life with happy as much as you can and don't worry about what you accomplish, but if accomplished goals were worthwhile. Hope that helps! <3<3<3
