Like most, mine was through self discovery but I don’t remember what age I was.
I found my technique of laying on my front and rubbing my cock rapidly between my legs gave me great feelings of initially what was a dry orgasm. Eventually leading to producing cum which required more creative method of dealing with the subsequent mess.
I remember using this rubbing method between my legs for a long time before discovering more usual ways.
I used to lie on the floor on a towel before showering in my parents ensuite and rubbing one out, until one night I got caught, when one of my sisters was sent to tell me to get out of the shower for taking too long. (I came up with some lame excuse about trying to fix the shower screen door).
Privacy was difficult as there weren’t any locks on doors inside our house so my sister would have seen me laying totally naked on the floor.
That was the last time I used my parents ensuite for showering and took better care to ensure that future adventures were done in private.
As a horny teen needing regular private time, I eventually worked out that I could remove the door knob in my bedroom and pull out the rod between the inside and outside door knobs, which effectively disabled the outside door knob.