I think every man has thought about it to some degree.
I believe myself to have a very good life, I'm young, athletic, intelligent, own a preban AR15, have a honest, devoted, compassionate, healthy relationship, and the world ahead of me. Yet I still think about what everyone's reactions would be if I offed myself. I find it interesting thinking of all the people I know and what their reaction would be. I have nothing to lead to such thoughts but I still find myself pondering the idea every once in awhile.
I wouldn't worry about it, it's a very dispicable, selfish way to end a life though.
I as an atheist believe this is my one shot at things so I really try to live life to it's fullest, treating others how I'd like to be treated in return.
Just an 18 year old's thoughts on the subject.