Suicide is taking the life of someone who may be dear to others. In such a case the pain and shock can cause great suffering to those who were close and are left behind. I have known a number of suicides over the years and the loss to the parents is inestimable. Also a father who takes his own life often leaves behind a wife and children who have to live with their loss.
I understand the pain that suicide causes. I have had people near and dear to me, take that path. The most recent one ws my husbands best friend about a year ago. I've known this person since he was in grade school, and he was anything but selfish. A more giving, kind, unselfish man you will never meet.
There was a time when I was suicidal. I knew that suicide would hurt my family but I thought that my existance caused them even more pain. I felt like a complete burdon and not worthy of taking up space. I was certain that everyone I loved would be better off without me.
So no, I don't think suicide is selfish. I also don't think mental disease is selfish, and I don't believe bi-polar people are selfish, and I also don't believe that schizophrenics are selfish.
People don't off themselves because one day they decide to think only of themselves. They reach that point very slowly and painfully.