The closest I ever came to considering it was when I was 24 and living in a bad situation that constantly had me angry, sad and stressed out. Since then, I have a "fantasy" every now and then of if I did something, but it's only because something upset me and I'm thinking how peaceful it would be to never deal with it again, as well as imagining how I could slip away, change my name, skip to another country and disappear from my family forever; but that's all these are for me, just fantasies and sometimes, I think of goofy situations that make me laugh.
At this point now, I know I'll never pursue that kind of thing, because what I really want to do is take steps to have more control over my destiny and not let temporary things overwhelm me. I want to deal with people and situations in a way which benefits me positively. For this reason, I like reading biographies of people who have made successes in spite of dubious circumstances, because often times, it helps give me a more realistic perspective of my own situation and how it's not the worst one that anyone ever had to live through.
The most driving aspect about it for me I suppose is that if I were to go through with such a thing, I'd feel like everything I fought through until now would have been for nothing and I think of how people I've known would feel. Also, in some weird way, I also think about how in the future I might have had the chance to help someone else if only I stuck with it, even if indirectly, like them reading my autobiography.