Flatline

Hey dude, the flatline can last a while, but that doesn't necessarily manifest itself in lack of motivation for everyday stuff, could just be hormones or wide context. And actually the flatline time is the best time to try and reconnect with what really matters in your life, whether its studying for key exams, keeping fit, spending time with loved ones etc...

If i were you I would try and even forget the word flatline for a little while - maybe read up on some motivational techniques (things like exercise, meditation, getting in touch with your creative side) can all be good to motivate.

You're doing real well considering your age - just to be aware of these things is a blessing as it will help you to be a better person, and avoid the route that many of us older guys (and gals) have taken (18 years of PMO since I was like 14yrs old here). If you start off right now, you'll hopefully stick to that path!