I think it's something like FOMO. Even if you're having fun in one game, it's ruined because in the back of your mind you're thinking about the other games you could also be playing and perhaps you'd be having an even better time with them. So obvious answer is obvious - don't think about your other games. Just pick a game, and go crazy with it. Probably some good relationship advice metaphors in there too.

I just mention this because I think what describing something basically 100% of people experience, and it completely ruins gaming for many - or they think it's because they're an adult or whatever. When we were young and had limited access to games, everything was amazing. Then you have a Steam library with 800 hand-picked games, many of which you've never even launched, and you're like 'mehhhh, nothing to play.' It's just FOMO.

Of course this means you'll literally never get through your library for most of us, but what can you do? If our younger selves could only imagine us trying to deal with such brutal problems.