Fellow Boy Scout showed me first time when I was 11-12, he was maybe a year older than me. I thought I was pissing in my sleeping bag, lol.
For whatever reason it didn’t start me on regular masturbation. Never tried on my own, at least not to completion, I’d experiment getting hard in the shower though.
At some point many months or even a year later, a friend and I were looking at Playboys and getting hard inside our pants. He said “my brother has this vibrator thing want to try?”. It was some sort of electric handmassager with the rubber surface removed, we took turns placing it over our hard ons (still inside our pants) and lo and behold I’m in some sort of wild mindless sexy funk and he says “look you did it” and there was a spreading wet spot on my pants. This was also my first experience of immediate change of mood after cumming, lol! I said bye, got on my bike and rode home hoping the breeze would dry my wet spot.
For whatever reason that day broke the proverbial dam, and daily++ alone times began in earnest.