So, I started wondering why I procrastinate so much. And of course I stumbled upon a bunch of ridiculous psychology websites telling me that it meant I was depressed and immature. Adding 'psychiatry' to my Google search, however, produced a very interesting article called "The Science Behind Procrastination." (you can read it here) As it turns out, we procrastinate so much because we're built to!
Basically there's two parts of our brains, the limbic system and the prefrontal cortex, and they're constantly at war with each other.
"Never put off for tomorrow that which you can put off forever."
The prefrontal cortex is like one of those 'how to study' people who tell you to do your study several years before the exam: it can see long-term benefits and wants to plan. It's a lot weaker than the limbic system and is more advanced, making decisions and analysing information, and is what sets humans apart from most animals.
When we have to do something, the limbic system has a war with the prefrontal cortex and since the limbic system is like a veteran of the army it usually wins.