I grew up with real guns, and have never had the urge to go on shooting rampages. I carry concealed all the time and have not shot the idiot drivers on my commute to work. I have played a few hundred hours of Destiny, and oddly enough I still have no urges to go on a shooting rampage.
I have drawn a pistol twice to prevent a robbery and a car jacking. Neither time did I shoot the perp. However, the crimes were prevented.
I recommend you only buy games appropriate to your age.