Sometimes I used to be like that too; what worked for me was really quite simple, I just started doing it. Once I got doing it, it became enjoyable, I ensure to tell myself EVERYTIME I take a piece of clothing off that it must go back to its proper place, same with shoes, books, etc...
Doing short imaginative sessions where I would (in the first person) be picking up my bedroom or doing something I enjoy in my very neat and clean bedroom helped enormously, if you can feel it, then you are there already - after a few of those and was no problem for me.
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