Everybody dies one day, literally everybody. We all are going to die sooner or later one way or another. It's going to happen because of an old age or because of our own choice but it's going to happen and we will have to face what comes after death no matter what. And think about this, literally BILLIONS of people have already died through the whole history of humanity, and many many of them died of suicide. They have seen already what comes after death, we will too and we won't be alone in it and we won't be the only ones who saw what comes next.
Another thing I like to think about, think about someone you admired in entertainment or general history that has died already, if you have someone like that, they have faced the death, so can you and you will face it just like someone you admire did too.
Another thing I also like to think about is that this world is very big, literally as I type this there is someone somewhere in this world dying at this very second and at the same second as you are reading this. And the chances are that there is someone killing themselves at this very moment as well. You might be miles apart but when you decide to do this, chances are you won't be the only one in the world doing it at this exact same moment. And you'll face what comes next together.
I hope this helps.