Truth is, everyone is selfish, because we have all done something for our own gain, not to help others, and we have all wanted someone else to fail, to never succeed, that's why we do everything in our will to put that one person down. But it's not just jealousy, there are many ways humans have been selfish, such as letting the earth and animals suffer and die, and living knowing there is something we can do to help others stop their suffering and live a better life. Humans were born to be selfish, that's how we're alive isn't it? If we spent our whole life trying to help others what would we be, we wouldn't be able to enjoy our own life which is short. Yes, life is short that's why we make the most of it being selfish most of the times and making ourselves happy, and that is the point of life, be rich, live in a huge mansion, isn't this the life we all want, probably yes, but to get there we must make some very selfish decisions.