why is this such a sad world?

Recently I have learnt and discovered a lot about the world I live in, not that i have been blind to everything going around me for the last some 20 years or something, but then there are some days and moments that teach you so much as they pass by you. I think my recent months have been full of them and saying that i have not learnt anything significant out that would be the biggest lie on this planet.
The ugly truth is that each one of us hungry for love, most of us are born in a home, where mothers and relatives crave to take us up in their arms to caress us, and to touch our cheeks, or to hold our tiny fingers, we see so much love and we are brought up in a environment where we only see love around us we see how wanted we are there and we think that this is always going to be the case. most of us cant take rejections easily and then we actually grow up and move out into the world, and then the truth hits us and we learn that this is a vicious world where no one cares, everyone is bitching behind you and making fun of you for something or for some petty reason, even out of jealousy, or something, and then we are so hurt somewhere that this world is not what we had been seeing since our childhood, but still we try to change and evolve into a person whom this world would accept better and love it as their own which does not happen, and hence we are left feeling sad, lonely and miserable, it is a weird world which just doesnt let you live the way you want to. We keep on dancing on the whims of this world and this world and the people contained therein. But that leads to the question, are we happy? does this make us happy? Changing ourselves is never a good idea, whenever life sucks we always try to figure out whats wrong with the world, maybe the starting point should be that "We Suck" because we have always been made to feel like a princes or a prince at home, where every demand was entertained. Life changes and so do we have to, whether we want it or not, doesnt matter, so be prepared to change yourself if you really want to survive, you have to be fake at times, superficial, to pass a smile to someone whom you might just hate hate and hate, but then you have to do it, to live here, in this world, which would no let you live happily otherwise too, just take care of the line in between, you know the fact that we can never make everyone happy, concentrate on those who really care about you, but yes at the same time, be diplomatic and know where to pass the fake smile and you would survive through everything, that is the cardinal rule of survival.
good luck.