Fun is up to the individual. What one considers fun the other does not.
When I was growing up, my parents, in their quest to make me "normal" or to appear "normal" would often drag me away from the kind of things I thought were fun and try to force me into other activities. They would insist these other activities I had no interest in were fun and what I was interested in wasn't fun.
Once I had engaged in these activities I'd be asked if I had fun and get screamed at when I answered I hadn't. They wanted me to have fun other people's ways, not my own way. I often said that I should be allowed to have fun in my own way, and that my siblings should pick their activities and I should pick mine.
I preferred doing things like buidling electronic stuff, reading about computers, cars, technology, and the like, not running around outside. I was the kind of child who could amuse himself for hours with things like that, or creating adventures with action figures.
The only advice I have is to try different activities to find what you like. If you do something once, you don't necessarily have to do it again. Find and make your own "fun!"
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PrisonerSix
"I am not a number, I am a free man!"