Sometimes moment when you need to start something and getting fun is not at the same time. These events could be separated in time by years or seconds and you deleay it anyway. Trivial example: I know that I'll feel fantastic after cold shower, it's just impossible for me to be depressed after it, but most of the time I have different reasons why I'm not doing it this time. When the fun is few years away it's event harder.

But yes, it's good idea to ask yourself is it actually fun for you.