Even someone with average natural talent in everything, can become above average by picking a less competitive niche and learning to excel. For example, there are a lot of average athletes who are good at ultimate Frisbee.

Also, it's not just about being above average or below average, it's also about getting that dopamine hit for performing a task successfully. An average athlete can have fun playing a game as long as he is competitive. An average math student can enjoy math as long as the material is not too difficult and not too boring.