I'm in my late 30s. Setting aside the "diapers" specifically, I think I'm still stuck, in several ways, in sort of toddler behaviors. (Also, some teenage ones. Like, I still have and drive the same exact model topless Jeep I had as a first car at sixteen - I bought this one at 18 and have had it ever since. But I digress.)
Like, when I was a kid, I used to have messy accidents, where I didn't want to stop doing what I was doing to head to the bathroom, and ended up with skid marks (or worse). Never grew out of that. Three times this week!
Or, transitional object … The blanket I used to carry around has been gone for decades, but the collars on polo shirts, and the satiny fringe of blankets on beds, took its place. Nowadays I've used a linear progression of polo shirts that outlived their usefulness as clothing (holes, stains, whatever), and have become my "carry around" blankie. (Only around the house, mind you.) It's draped across my lap while I tap this.
In other parts of my life I adult reasonably well. I have two rescue dogs I've had 7 and 5 years, respectively, and they're in good health and no worse adjusted than when I got them (one's a mellow lover I've had since he was a puppy, one was almost feral when I got her as a shelter-pull street stray). I have a career that I haven't managed to completely torpedo (I'm a lawyer). I own a home, though with various ups and downs I've come close to losing it a couple of times. I'm a licensed pilot and I'll have my instrument rating in a few days. I have more than 200 hours logged as "pilot in command." I occasionally even date semi-successfully.
So W.T.F.?! Confused.