Sounds like your trying to get rid of a safety factor. I won't commit suicide because my family will be sad and it will be selfish.
I've known a few people who have committed suicide and I don't think the first thing you think of is their selfish for doing it, but it does have consequences for those around them, and a chain of events happen. Suicide is very different than death by natural causes, as people may be in trauma and think could I have helped, what could I have done. It may cause all kinds of emotions for the left over, anger, sadness etc.
People who commit suicide are not selfish, they are in so much pain, that they think of their own pain first, this is natural. I'd suggest you get yourself some physical help. Take care and keep going, a lot of people on the forum are in the same position and will offer support where they can.