I think I was born this way. Some of the memories I carry with me still, involve me or someone I was with having an accident their pants. Growing up, I wasn't an every night bed wetter, but did have the occasional wet night, and I remember all of them.
Once, I wet the bed while sleeping over at my parent's friends house. The next day when my parents came to pick me up, they spotted me playing outside in a diaper and plastic pants, and asked why, and I still remember nonchalantly replying, I peed the bed, and have to wear a diaper now. I am sure the adults involved were trying to humiliate me, but I rather enjoyed their wardrobe choice, so their plan didn't really work.
Another time, I had a dream about needing to pee, and in the morning discovered I had peed the bed. I was in grade 2, I think. My bed wasn't changed, and the next night it was so cold to crawl inside a still wet bed.
A few times, I peed in the bed from laughing.
I remember all the times I pooped my pants growing up as well. One, is still very vivid in my mind.
As I grew up, I always seemed to befriend the kid in school who wet the bed, or had daily accidents. As a pre-teen, I started go in my pants on purpose, and actually made friends with someone who did the exact same thing. They would pee or mess their pants, for no other reason than they wanted to.
When I started dating, I only had one boyfriend who didn't mind my habits. He never even batted an eyelash if I walked down the street physically holding the pee in with my hand. He didn't care if I soaked the front of my jeans with pee, or pushed a load of poop into the back. In fact, he seemed almost proud to walking hand-in-hand with a gal who went in her pants. If we were being intimate, he would encourage me to just pee, instead of leaving his side. The person I married, encouraged the same thing, at first, but later grew to hate the fact that I peed the bed, or wet and messed my pants. He would humiliate me and abuse me. I actually think, part of the reason he cheated so often, was because he was searching for a gal that was normal, and didn't use their pants as a potty. I think he thought I would outgrow it.
Here I am though, on the planet for 5 decades, and still enjoy going in my pants. It's not something I, or anyone will outgrow. We were born liking what we like. I often wonder what life would be like had I stayed with the first guy, and never met the second one. I wonder if I will ever find another like him.
oh ps ... I ran into the first one through social media. I wasn't surprised to learn that he labels himself a Daddy/Dom these days. Every once in a while I get a message from him about how much he regrets that we didn't stay together. It's an ego boost for sure to learn that in someone's mind, I am the one that got away.