Selfishness? No?

"If you don't live for yourself, you cannot survive in between heaven and earth."

This is a part from a previous post.
"Live for youself? How selfish!"
Selfishness? What is selfishness? I suppose we all know. Now let's talk about a very, very normal thing: saving money. Saving money is a smart thing to do as you would have money to spend just in case something happens, and saving money in large quantity is usually about leaving enough property for the next generation, we usually do this when we have a lot of extra cash to save. But why save more by limiting all your expense when you are already saving a little?
Now when you save for the next generation, your aim is to let them have a happier life. However, do remember that after you die, you can't see their happiness, and I actually found that when you want to make others happy, you actually do it because you will be happy. How can a dead person be happy? If we look at it this way, isn't this also being selfish?
What we see everyday, things we call 'selfish', are actually 'surface selfish'.
Another example, we call people who litter for their own convenience selfish. But what about those who are promoting green actions? They claim their purpose to be ensuring a good eco-system for the future generations, for the survival of human kind, so it's actually about the living on of humans, can't we say this to be selfish?

I think there is no 'good' or 'bad' in this world, all these are just descriptions, words created by human, and we are taught to produce different imageries when we see different words. All of them are illusions, but illusions which keep us alive with our daily life, which keep the world going on as normal! But what is normal? Everything around us seems normal to us, but surely not to any other beings.
The extinction of animal species. We are calling ourselves cruel to have made some animal species extinct. But if such advanced knowledge never existed, and human are just like animals, would we even know anything?
Nowadays, the society is all about, competition, fame, pride, success, manipulation, deceit; things WE have created for OURSELVES. All words are just a dream, all humans' dream, in which we have sank, too deep, too deep.
After thinking so much, I am confused, and very much irritated.

But what is 'confusion'?