This is a bit of a long tale, make a coffee and get your reading glasses.
I was a bedwetter on and off until about 12, but it was never frequent enough to warrant wearing Drynites, so the nights that I didn't wet the bed, I would always wake up really busting to pee, and obviously at age 12-13, my sexuality was developing, and I specifically remember one cold morning, I woke up really needing to go, but it was too cold to get out of bed (I didn't know it at the time, but I was also horny), so I held it for as long as I could, until I let enough of a dribble out to wet the front of my undies, that sparked a connection between being desperate, having damp undies, and being horny. There is also at least one instance that I can remember of waking up in the middle of the night in a wet bed, putting a towel down, and going back to sleep, still in my wet pajamas, kinda wishing I had Drynites or something. I remember mum putting me in a nappy when I was 5 or 6 as a joke (she used nappies as dressings for her horses injured leg while it was weeping), it must have triggered something, because I can still remember it, but that isn't the moment I became a DL, that was more progressive. When I was 14, my parents started renovating the house, starting with my bedroom, so I moved onto the sofa-bed in the living room, which is also where the computer lives, so now I had 24 hour access to the internet. It started with girls wetting themselves, then girls wearing and wetting nappies. I had been using sanitary pads and just wetting my undies over the toilet, I then made my own nappies with paper towels, rubbish bags, and packaging tape (with a pair of scissors nearby to take it off). This all happened between 14-18, but I never got a chance to try "real" nappies as I was living with my parents. One day, when I was 19-20, I was lying in bed with my girlfriend (she was house sitting for a family friend at the time, I wasn't supposed to be there, but we didn't care, no one knew), and we were discussing fantasies and kinks, and I mentioned that I was into wetting, and she said that she had always wanted to try it, so off to the bathroom we went (this house had a wet floor bathroom, so any mess would be washed down the drain), once we were back in the bed (minus undies, they were in a soaking heap in the shower), we continued out talk, and after a long and awkward conversation, I let her know that I really liked nappies, she was super supportive, she wasn't really that into it, but she was really understanding and non judgmental, so the next day we went around a couple of stores and came back with some girls Drynites (I had heard that they are better for more developed boys because the soak pad was lower down), a pack of dummies (Pacifiers for you Americans), and a baby bottle. That night we both slipped on a Drynight each (even though she wasn't that into it, my girlfriend wanted to give it a try in support), and it was heaven, we had a lot of fun that night, and our bodies hurt like crazy the next day. She made a comment of how cute I looked wearing a pink and purple Drynite, and she managed to convince me to wear a pair of her undies (I didn't take much convincing is I'm honest), which progressed to a dress, and even some pink fluffy pajamas, and some more childish garments.
And that is the story of how I became a Straight, Male, Panty/Nappy Wearing/Wetting, Crossdressing, Baby Girl. Probably more info than what OP asked for, but it was a journey.