Trying to find what you are good at is not the right approach. But you are onto something in this question, just asking about the wrong part.

What is it with these projects, hobbies, and jobs that disinterest you? What are you avoiding?

Armchair-ing: Maybe you are in the cycle of having higher expectations than what you can create? Avoiding creating a project to finish as the result is not what you had set your expectation to?