Does Anyone Know What Dying Feels Like?

So, I have a big fear of death, I only recently came to terms with it after rejecting it sense middle school and basically threating myself that I'd kill myself before anything or anyone else could, to anyone thinking thats odd I'm not sure I agree but its definitely not stable.

But has anyone ever been told what death is like? what its like to feel life start slipping, does it hurt? is the last second peaceful? are your nerves so busted you cant feel it?
Or is it agonizing and and confusing? never given enough time to process it...

I know this is a touchy subject and I think thats why I wanna put this on here.... if living is so nice then whats dying like?

Also for closure I'm not gonna kill myself so I dont die as painfully, well not right now atleast, I'm gonna be like 50 probably, give or take........so yeah thats it
Any advice on how to stop envisioning your own death helps <3