The same type of people who say 'the world doesn't owe you anything' are the same type that say 'stop feeling sorry for yourself' (Whatever that means). While suffering is part of life, it shouldn't comprise the entirety or majority of our existence. We deserve to be happy.
Given that life is unfair, chaotic, and none of us choose to born into this. Often times people who like to tell us negative things like that are not the type looking for a solution to the problems the world is facing. They just don't care and they truly only think for themselves. Pay them no heed. Don't listen to them. You have a place in this world, and the world itself doesn't 'owe you nothing.' But as a person, the world owes you 'Respect, decency, and hope.' Because if you're posting here, you've endured enough, and deserve those three basic things.