Let's start with an example I call the Dog Poop Paradox. Pet mess was everywhere when I was young because picking up after your pooch was not the norm. Then customs changed and the streets were gloriously cleaner. Did that make anyone happy? NO. People barely noticed. They do notice an oops, however, and they get plenty mad about it.
Our brain evolved to scan for problems and it is skilled at finding problems when it looks. For example, reporters predicted the downfall of civilized society when the bicycle was invented. They warned that people would flit from here to there instead of having long conversations, and that we'd retire early from exhaustion instead of conversing in the evening. We have inherited the brain that helped our ancestors notice threats in time to act. We are skilled at finding threats, even as we seek rewards.
build yourself a positivity circuit
Negativity will engulf you unless you build yourself a positivity circuit. To do that, spend one minute looking for positives, three times a day for forty five days. This trains your brain to look for positives the way it is already trained to look for negatives. You may think there aren't enough positives in the awful world around you. But you don't have to perform in Carnegie Hall and rescue orphans from burning buildings to create positivity. Any positives, no matter how small, will build the pathway that seeks and expects positives. Just appreciate the absence of dog poop on the path in front of you and neural connections will develop. It may seem false to seek out positives when negatives are so apparent.