I was about 10 (or maybe 12) when a friend in my neighborhood let me try out his air rifle and air pistol. I loved it-- but the pistol took more strength to pull the trigger than I could manage. Then another friend who had a BB gun let me take shots at the Evil Knievel doll he had swinging from a string his basement. (Of course, when his mom saw the damage in her wall from all the BBs it ended that little game.) Years later, another friend often took me with him to the firing range and since he was a gun collector, I got to shoot all kinds of fun stuff. And being the only woman at the range meant guys practically lined up to let me shoot their guns-- LOL.
I'm not sure I answered the question. Nobody ever really taught me how to shoot-- it was just a matter of figuring it out by trying and getting tips along the way from those kind enough to share them. I also spent a lot of time poring over my Red Ryder BB Gun catalog, dreaming of the day I'd own my very own BB lever action rifle. I never did buy it, but looking at my gun cabinet now, I've got nothing to complain about.
Oh, and, I'm still learning how to shoot... (Just ask all the grouse that got away last season.)