Hello doctor, I am 18 years 3 months old boy,i was a very fat kid since i was 10 years old,now i have lost my weight and i m fit now.bt my penis has not grown much since my childhood,now it measure 3_ 4 inch while erected.i am getting very tense n feel very bad about myself.i had got a very bad habbit of masturabating,n it was like daily,is this the reason of not increase in size? i am worried about my future marriage life,plz suggest me something