If your motivation for a task or goal is in any way compromised (because you lack the skil, or don't take it seriously, or think that you've done so far is good enough) don't take it on. Find something else to show the world how much you care, not how little.

If you often feel tired, your body is telling you that it's not getting enough sleep.

If you're getting eight hours of sleep a night but still feel tired, you may be suffering from a sleep disorder or interrupted sleep.

Sometimes you will feel that you are too free or you wasted too much time on unnecessary activities and you are not moving forward at all. 

This is the time when you need to think about your goals and what you need to get done. This is why you need a to-do list too.