No, I do NOT believe that it is in most cases. I can't say all, because in the instance where you have small children I suppose it would be selfish to put yourself before their well being.

Assuming, then there are no children, I'd say more than likely it's not selfish. The people that say it's selfish are the ones that, more than likely, ignored your mental pain and it's their way of coping with their guilt.

I do NOT believe anyone WANTS to die. If we had our choice we'd be living healthy, happy lives. When suicide becomes an option or a thought it's because death is a better alternative to living a life in mental anguish.

Having written all this I'm not encouraging anyone to commit suicide. It's just my personal observations on the subject.