I'm struggling with this too.
I did the same thing what @Dr Iron Arc said. Made a list of what's bad, what's good, and what I expect going forward in my life. Compare those to non-existence. If fear was not a factor, I would choose non-existence without hesitation.
But fear is a factor. So far, what I have learned, is that there are no effective ways to deal with it. You can't get rid of the fear.
Occasionally, there are posts that say "if you are ready, you won't have fear, you'll feel peace". Maybe some people do, I don't know. But that's not how it works for me.
I have the feeling that if I want to go, I'll just have to do it despite being afraid. It's f*****g scary, and I have to do it anyway. I'll just start planning it out, get the accessories, find a location etc., and not think about it too much. Then I'll either be able to do it or not, that I don't know. It scares the hell out of me, even just thinking about it. What if I do all the preparations, go to my location, and I am actually able to do it. What if it is actually going to happen? Is this me? Do I need help? Is this really how it's going to end? Is this what I have become? When I think about it, I feel this deep sadness, emptiness, and dread. 'Dread' is a good word, I guess.
But I feel I just need to start getting prepared, because if I'm waiting for feeling peace, it's never going to happen.