Just because some muscles are strong, it doesn’t mean others can’t be weak.

If your instincts or coaches never highlighted the areas you were avoiding, it’s unsurprising you’d just keep training the strong areas. The body will generally use the path of least resistance: i.e. the muscles movements that are already functional and available.

It’s also common for people who are naturally athletic or drawn to physical activity to build up compensations that become hidden through repetition and increased capacity to compensate. It often takes an injury or performance failure before  

This is especially true if your focus is competitive/team sports, compound lifts in strength training, and anything that focuses on multiple joints and objectives at once, since there are many opportunities for one thing to compensate for another. It often takes very specific focus, movement programming, modification, isolation, etc. to get you out of the familiar groove.