That's likely true with anything else in your life. I love to cook, I'm much better than people who doesn't cook but I'm worse than anyone who dedicates 4-8 hours a day every day.
But I don't care, I enjoy it so I keep doing it. Do you not enjoy chess enough to play it without needing another reason?
You play chess to win and losing is stressful and unpleasant. So you train more to increase your chances of winning.
I still enjoy playing just for fun, but after a couple of "fun" games, the competitive side kicks in and it stops being fun and becomes a goal.
But I don't care, I enjoy it so I keep doing it. Do you not enjoy chess enough to play it without needing another reason?