alt Hacker NewsI retired a few years ago and now do a slew of things (photography, robotics, 3D printing, etc.) entirely for myself. I'll start a project, have a blast learning/building, then simply move on to the next thing.
Learning for the sake of learning is one of my favorite things in life.
Not finishing - or even being able to define the finish line - is a great sign you're doing this right. You're not a tortoise seeking mastery; it's ok to be a distracted hare!