Very much this. I cannot abide a mess. As a kid I never once had to be told to tidy my room, I always kept it spotless. Its borderline OCD levels.
If I'm settling down to watch a film, I can't have stuff lying around the living room, it HAS to be clean and tidy first. I've always been like it...
I fell into a comfortable rut, and have never had the motivation or drive to climb out of it. I feel like I could have done so much more, but....I just couldn't be arsed.