“[…] this fleeting world, which in some strange way keeps calling to us. Us, the most fleeting of all. Once for each thing. Just once; no more. And we too, just once. And never again.”
— Rainer Maria Rilke, from Elegy IX; Duino Elegies (tr. by Stephen Mitchell), 1922
I hate how acknowledging unfairness in the world is seen as "childish". Maybe children are right. I don't think you should be proud of the fact that you've become complacent with the state of your miserable existence and took on this loser "it is what it is" mentality. Things can be better.