Penis shrinking ?!

I'm 29 years old, before 2 years I start noticing that my penis is being smaller from 17cm to 16cm, I still doesn't know the reason, I make some visits to some urologist and they say everything is OK with your penis and it's only a psychological problem, they just scan my penis with they very old scanner..

is there any prostate problem with me ? or something like that ? I born with a curvature on my penis.. Maybe this is a reason but if yes, why that's not happen before 10 years ?... My penis was 17cm since I been 12 years old (I start masturbating when I was 10 years old and continue doing it now...)

Some times I think the problem is because before 2 years and a half I make a hair transplant and doctor gives me three types of medicaments but he doesn't give me the name of these medicaments, I use them for a month..

While the penis does not have any muscles as such, similar to muscles if they are not exercised the penis can reduce in size. Unfortunately, some males masturbate like crazy in the hope that their penis will get bigger - but this is not the case, but will help to regulate the size by not allowing it to shrink.
So how frequently do you masturbate? Once a day, more, every few days - what is happening for you on this? When you masturbate how long is your penis fully erect for? A few minutes, 10, 20 or 30 minutes, an hour, 2 hours or more - what is happening for you regularly in terms of time erect?
You know about how to make your penis have a stronger erection if you penis is no longer fully erect while you masturbate? - such as flexing or shaking the penis … ?
Lots of males have a curvature to the penis to some extent or another, it is only when the curvature is severe that this can impact on the quality of your erections - a urologist would have advised you on this …