Do people who commit suicide imagine that they are about to enter an improved version of life?

I can appreciate that some people with terrible disability, or who are unjustly imprisoned with no hope of release might just get tired of existence and decide to end it. I am NOT talking about them. I am talking about people who are healthy and free. Like say Kurt Cobain or the like. What alternative do they imagine exists that they are going to “go there” via suicide?