Hi I'm A 17 Yr Old Guy!! And I Masturbate

hi i'm a 17 yr old guy!! and i masturbate for like 4 yrs now, like once or twice a day!! my penis is like about 5 inch!! and i think for those past years he didn't grow!! i don't know maybe he did but i don't notice the difference!! can please someone tell doe masturbation affect or penis size?? can he grow more in the future??