You have value proportional to what you can offer to others. I don't believe people have intrinsic values. To themselves, maybe, but not in relation to others, which is more important because what's the benefit of feeling you have intrinsic value, while others avoiding you. We need to live with others while feeling valued and respected.

Some people try to depict the picture that humans are god-like and not selfish beings, but life is just about who can advance your interests.

This maybe as negative picture, but I think this is the reality, and most people deny it or don't even think about it, because people don't like to think of themselves as selfish self-centered beings. It doesn't make them feel good.