Grew up in the city and my family didn't own guns. Played with toy guns (still PC back then), shot a couple of times at a friend's farm, etc. Never had much opportunity to develop an interest. Went out for the rifle time in college (still had a team back then) and did well. That's probably when I first got the itch. But subsequent grad school, getting married, new job, etc ...
My father-in-law, however, is a great outdoorsman--hiking, hunting, fishing. He and my wife conspired to buy me my first gun, a Mossberg 500 with vent rib and slug barrels. That got me started. I started exploring handguns as an alternative to shotguns for deer hunting (shotgun only area of NY). As my interest developed, I fell in with a guy at church who was big into the 2A. He got me started started taking defensive handgun courses at LFI.
So now I pass it forward. There are a lot of young people who are shooting enthusiasts because of my years as a hunter safety instructor and my standing invitation at church, "If you want to learn to shoot and hunt, I'll take you." And my own kids have grown up with guns. They are not all interested in hunting, but they all know how to shoot.