A few years back, I had a conversation with my best friend during which he said, "What's this world if not for me?" What he meant was no matter what, at the end of the day we live for ourselves. Everything and everyone else is a corollary, a result or reason for how I am living my life. He also expanded it by saying that when I don't exist, the universe doesn't because the universe is ultimately an image formed in my mind's eye and it ceases to exist as soon as I am not there.
I agree that this comes out as an extreme viewpoint but there are things in what he said which makes me wonder. Isn't it really to make myself happy that I care for my friends and family? If I am not happy and satisfied in some way when doing something for others, how long will I continue to do it? Stuff to ponder upon.