I miss club penguin
What reminded you of Club Penguin?
I read an article about it in a comic. It sounded interesting.
You might be nostalgic for simpler days and miss your childhood because you're exhausted from the current situation in your life. It's okay to enjoy things from the past but don't forget keep yourself grounded in the present.
It's hard to find things to enjoy when I have to work hard all the time.
It can be difficult to be an adult and have free time so I can understand feeling nostalgic of an easier time. Until you can find time, thinking of the past can at least give your mind a break from work.