Pehle toh apne mann se yeh baat nikal dijiye ki yeh sab hastmethun ke karan ho rah ahai kyunki Hastmaithun ek safe /surakshit tareeka hai apni santushti karne ka. Isse koi nuksaan ya beemari nahin hoti Aur jo aap bata rahe hai aisa hona bohot common hai so don't worry zara yeh bhi padhiye: http://lovematters.in/en/resource/penis-shapes-and-sizes