Take a look at the pictures in my signature and tell me you do not see any growth. Then go view drilla9s clamp`orama thread and tell me that you see no growth.
Your doctor is right about one thing, penis stretchers do work.
I understand your doubts, I was just like you. Even when I had grown and taken pictures to prove it I still did not believe.
I started to believe when I hit 17cm in length because I have been measuring my penis ever since I was a little boy and never through out my years have I ever measured 17cm when measured from the top.
So keep on keeping on and you to will see gains! Take a erect, bone pressed picture with a ruler and save it for later. Sometimes your own brain will deceive you.