Get a small cheap to shoot rifle, maybe a 223 and spend lots of time shooting. It doesnt have hardly any recoil and you can shoot literally hundreds of rounds through it without getting sore. I used to jerk the trigger and dred the pain of shooting my 270 when I was your age, so I put thousands of rounds through my 22, 22-250, aqnd 22 hornet and got used to the light recoil. Now when I shoot my 300 mag I dont anticipate the shot because Im used to light recoil, just watch your eye, Ive popped mine a few times with the 300 because I forget it kicks until I pull the trigger