Life is terrible for a lot of reasons. Everyone knows that. Humans have a strong negativity bias and are never content with anything for long. Humans have a lot more options than most mammals, but with those options comes the increasing worry that they're not using their time effectively. We want to party, watch movies (or anime), play games, etc. But we also want to make the best possible use of our time. We're torn between indulgence and optimization, and the more options that are created, the harder it is to optimize our time in any objective sense. This is why people with more restrictions are on average happier. This is why people join religions cults, start families, and sabotage themselves on a daily basis without even realizing it. Options create uncertainty, and uncertainty is scary.
For me personally, I find that learning and accomplishing things best sets my mind at ease. I haven't really had fun in a long time, because anxiety is always quick to follow. I understand that this is what creates unstable workaholics, but I'd rather work in apathy than play video games only to feel extremely anxious. I imagine many kids stop playing video games when they become adults for this reason.