Each to their own brother, I've personally been at the point where I didn't think I was going to make it and it's time to make my peace and yea you normally don't have the time, I'm thinking hypothetically if your given the heads up and have already said your goodbyes to people. Also if you've been given that opportunity whatever's claiming your life is most like a terminal illness and you've probably had months to mull over the small details and it's time to go out with a bang, everyone is different though. Some people would rather spend their sat evening watching a movie with a cup of tea and others up to their eyeballs in various substances stomping it out at a rave
I thought I had no fear of dying til I almost died numerous times haha I'm comfortable with it but your either stupid, crazy or have never had a close enough call if you have zero fear, it's healthy to have a little fear of certain things haha
I'm not sure why you're assuming it's going to be horrific and painful, generally if you die at a young age it's an accident and will be over before you know it, every time I've been close time actually slows the fuck down and all of a sudden you can process your whole life and what a fuck up you've been and oh shit this is possibly actually happening and I thought I wasn't scared but fuck I didn't get to say goodbye to such and such or get around to whatever you always wanted to do. Then bam you come to in a hospital or dazed and confused wondering how the fuck you didn't just die.
I personally think on low doses of acid the world is clearer, more vivid and just fucking beautiful and I can think on a better level and I'd throw some smack in to make the ride a touch comfier, I did get very used to functioning on acid when I was younger and eating copious amounts almost weekly due to a never ending supply though so maybe a little biased. I reckon it'd actually help you let go and enjoy your last moments more and you wouldn't be worried bout letting go of reality and diving into the trip at all but pondering your life and what's to come haha