Oh come on…You should be able to conquer at least this much if you ever want to write something. (Or accomplish anything, really.)
You don’t get anything in this life if you don’t work for it.
It’s only a question of what you prioritze (or what you’re able to).
I can understand if you do not have free time because of factors outside your control, school, work, family responsibilities, etcetra. I used to have that for a big part of my life too.
There’s no shame in prioritizing other things over writing fanfiction by your own choice, either, though you need to make it sink in that you’re not improving in writing by your own choice, too.
There is no excuse for “lack of creativity”, though. It’s an acquired skill, anybody who really wanted it got it by working on it.