This describes me to a T.

I had this same internal conversation with myself last night. I'm currently entrenched in a myriad of unrelated hobbies and pursuits, and last night as I sat at my computer and researched what knowledge I needed to build a violin, it hit me: I'm actually not mastering any of these pursuits. Golfing, Motorcycle Rebuilding, Objective C, Angular JS, Guitar, and the list goes on.

I decided last night to do what the article says: Choose one. Just one. and focus on it, serially, not in parallel. So, I've chosen one, and it will be my pursuit for the next 6 months, or until I feel I have mastered it. Then, onto the next one.