I don't know if I agree with the idea that we are all just looking after ourselves.
I have a bunch of hens and one rooster right now. When I go outside and give them treats. The rooster will run right to where the treats drop and make a funny sound to show the hens where it droped. Even though its his favorite as well, he will refuse to eat any unless the hens have had their fill.
Ask a mother if she cares more about herself than her child. That she would die if it meant saving her baby. That's the most obvious example, but most people feel much better when they give and sacrafice for others. I think society, especially western society, values the self over others. It's like a capitalistic warrior society we live in. It's great for the economy, but not so good for our wellbeing. It's just not balanced.