Your attachment to your belief is what is causing you so much suffering. The world doesn't operate in black and white. It can be just and fair, just as it can be unjust and unfair. There are no absolutes.

My suggestion is to work on your mindset. It's easy to look outward to see how others are doing for validation, but as the saying goes, comparison is the thief of joy. Once you are able to be present and content with your own journey and learn to be happy for others, no matter how wildly things can change externally, it won't be able to move you internally.