That I feel trapped in a life that does not meet my expectations. When I was a teenager, I thought that I would graduate from college a bit before I turned 22, marry at age 25, have a child at age 27, publish my first novel at age 30, have another child at age 33... I will turn 52 this month.
Although I did ultimately earn a BA and went to grad school (which I did not finish due to an episode of severe depression with psychotic features that made it impossible for me to concentrate on my studies), I have never married nor had children (though I am glad that I never had children, considering my double depression [persistent depressive disorder (dysthymia) + major depression] and PTSD diagnoses), nor have I published any novels (so far). But I am stuck taking care of my bedridden mother -- who could easily live another 10 years -- and cannot in good conscience predecease her. But after she has passed away... it would be much easier for me to ctb.
I would want to a) leave behind a relatively pretty corpse for a properly Catholic funeral (if, as I expect, I hang myself, I want to insure that my face is pale and placid in death, so at least people will realize that I died as happily and as painlessly as possible) and b) get to Heaven as soon as I can after my death. (A religious text that I read recently states that Heaven is God's to grant and not ours to take. However, I hope that God would be as merciful to me as I would hope that He would be to others who ctb.)