This was my life in college and I eventually realized I just had an above average prioritization mechanism. If it doesn't really matter, and I don't feel like doing it, it's not getting done.

It's actually pretty productive at baseline since I can do the things that do matter lightning fast, so if you're like that, just try to do more things/more varied things (for example start a class not related to your job or get a second job not in the same field). (Also different/more intense physical activity. I don't know if you're like that but I'm a standard issue adrenaline junkie in addition to having selective motivation.)