First gun that was MINE? Probably one of the most popular first guns.
Ruger Single Six .22
Second of "my guns" was a Ruger Security Six .357.
First handgun I fired was a .357 mag loaded with ultra-light .38's. My hand was on the grip, but I was so small that the guy had to hold his hand around mine just to keep it up. Finished off a wounded praire dog at 10 feet....that's a long ways when your 4 years old.