I'm going to ignore all of the other parts and address this: "The problem is I don't or can't stick with one thing."

I've found focus gets better with age. Young minds benefit the most trying to discover and learn as much as possible. You get bored when the initial learning portion vanishes.

Sometimes you need a project that has a wide enough breadth that it can hold your attention over a very long period of time. When one part gets boring, you move to the next part. Over a few months you rotate around but you must return to each piece and make it better.