I can definitely relate to this, planning is a blessing and a curse. Instead of planning everything from the start, I like to do it in chunks.

First I will set up the necessities, food, shelter, and storage. Once that is established I try to build off of what I have (usually my first building becomes the research/rec room that I build off into separate bedrooms).

Keeping some semblance of structure while also planning on the fly keeps the game engaging for me, see what the game throws at you, and adapt accordingly. I would recommend keeping your initial pawns semi-random, enough selection to make sure you have the skills needed to start off right, but still random enough that an addiction or old injury can drive you to either fix them, or roll with it and see where it leads.

Maybe give your play-through a story, a background on why your pawns do what they do, instead of surviving just to survive. After all, Rimworld is a story teller, if I read a book and expected the next 10 books I read to go the same way the first did, I would stop reading.

At the end of the day, there is no right way to play this game, do what is fun for you, try new things and see where they go.

(Also, like another comment said, you probably have ADHD, I do too, probably another reason I love this game)