Hey, I am a 15 year old male and I have some questions I would like to ask. First of all, my penis is about 1.5 - 2.5 flaccid, 3 at max. When I have an erection my penis grows to about 4 - 4.5 at max. I have been recently thinking if I have damaged my penis and stopped its growth. When I was from a young age, I can't remember maybe about 4 but I'm not really sure, I started masturbating. But the thing is, it wasn't normal masturbation. What I did was put my hands above my pants and pushed down on my penis, whilst moving both of my legs in and out at the same time. As I got older I started getting some pains in my penis, then I realised after I did this method of so called masturbation, I felt the pain. The pain could be anywhere in my penis, although after a long rough 'masturbation' session, I got the next morning a really sharp pain at the right side of the tip of my penis. I have hit puberty because my pubic hairs are grown quite a lot and my armpit hair is starting to grow. My voice is kind of depper er than what it used to be. 

Here are my questions. 

Do you thing I have damaged my penis growth? 

Will my penis grow if it has been long term damaged? 

What may the causes of the pain be?

Thank you.