To add to what everyone else said, I discovered that I like things with lots and lots of variables: shooting, sailing, computers, photography, engines, politics.
I don't like things that always stay the same and don't change much.
Hard to explain. But with shooting and guns, I can tinker with different calibers. Within calibers, I can change the loads (powder, bullets, I guess primers too). Then with the rifle (or pistol or shotgun), I can change the barrel, stock, action, etc. I can change my stance, position, breathing.
I can keep experimenting until I can hit my target with consistency. Then, when i can do that, I move the target back and do it all over again.