no,

one,its impossible to commit suicide unless u are severely depressed, regardless of the strength of your rational thinking. two, I think its impossible to be rational and selfish at the same time. Because u'd know its not right to cop out and leave a mess for others
but what is depression but a label society has given to a certain state of mind ? soldiers commit suicide to protect their platoons. they aren't labeled as depressed. u remember that bus driver who saved the passengers by risking his own life ? he died in the end. but was he labeled as someone who suffered from depression ?
the truth is society refuses to accept harsh truths. they used to silence people who criticized revered beliefs, specially religious ones, in past and now they do the same with science, if u call psychology a real science.
u are not allowed to question the meaning of ur existence and arrive at the conclusion that being is no better than not being. the moment u deduce that conclusion u are labeled as having a mental disability. u are depressed and society has the right to keep u away from other people and even force drugs down ur throat until u give up on ur reasoning. it's what they did to people who desired people of the same sex and it's what they are doing now to those who desire non existence over existence. they both questioned 2 fundamental values in society.