I don't understand. It doesn't make sense.
How can I complete a Japanese language learning course up to near 80%, and then just completely lose all momentum?
How can I work for weeks getting my pushup max to 100 pushups in 10 minutes, and then the minute I actually do it, I never do them again?
How can I work for days and months learning how to touch my toes, and yet when I finally reach the floor with my fingertips, I lose all interest in continuing practicing?
How can I learn the 1st Movement of Beethoven's Sonata No. 14, to near technical mastery, with only a handful of bars left to commit to memory, and out of nowhere my interest in the piece takes a hard nosedive?
I don't get it. It's like everytime I get to 80% suddenly everything just stops. And these aren't isolated incidents, they're key examples. This has happened a lot, with all sorts of projects, in many different contexts. I don't understand how I can be diligent and consistent, for seemingly any length of time, as long as I don't actually get close to finishing. Sometimes it even feels like the moment I realize I'm capable of doing something, I lose interest.
I don't do these things just to have done them. I do them so that I can further practice them and go deeper with them. I've tasted success so many times, only to allow the long-term rewards to slip through my fingers because I stopped short; for no other reason than I got bored or lost interest. To add insult to injury, it's not like I don't have the time. It's bothering me so much more now because I have all of the time in the world.
What does this mean? Why does this happen? And how can I make it stop? Thank you for any information you have!