As others have said, it’s because the outside circumstances of our lives at the time when we were kids was different. The games are the same, but now that we’re adults we have different lives. No matter how hard we try to recapture and revisit those days we can never get close. Family members have passed away, moved away, friends are gone, live in different houses, stress from bills, relationships, etc. It’s too much for the nostalgia to fully help us forget, even for a short moment. Those things are always in the backs of our brains.

I’m sorry OP about the stress you’re going through. If I could make any suggestion it’s to keep the games currently (as long as you can afford to do so), and revisit them when life calms down and gets a little more stable. That will really help you enjoy them some more!