ForewordI, by no means, ably completely to the advice I am about to state, so take head that I am not judging nor blaming nor commanding any of you reading this blogpost, lest it be the most hypocritical series of characters known to science. In fact, so much hypocrisy in one document has been known to cause black holes in the space time continuum, so take all that is written below with a grain of salt, nay, a bucket of salt, nay a Russian arctic oil tanker's worth of solid NaCl.
Main IdeaThe reason we are "unproductive" is that the activities we choose to do in our free time do not accumulate to a learned skill or lesson. I will attempt to explain this phenomenon with my own experience.
A Personal Experience
In 8th grade, I would come home everyday after school, plop onto my bed, and watch several episodes of a YouTube gamer. The videos were only 20 minutes long (which didn't seem as long back then but it's an eternity now). I would watch one, and since the related videos were just a tap of a finger away, I would watch 2 or 3 at a time. I did not have many of the games that the YouTuber had, so I felt that I was playing the game right along with him without actually having to buy the game.
Eventually, I noticed that I was indeed spending A LOT of time watching videos. Then, I realized just how much time everyday I had spent to this fruitless activity. The videos didn't make me laugh; they didn't teach me anything; they didn't accumulate to anything. In fact, I wasn't even making the YouTuber any money since I was watching on mobile. Thus, I resolved to unsubscribe from all of my gaming subscriptions (all 7 of them, and that's a lot).
I found that my grades had improved, and I was getting a lot more sleep. I was performing better in sports thanks to the new found rest. However, most importantly, I felt good about myself because I was making much better use of my time.