I checked that when I was 18 my penis size be the largest, with the walkway of these 3 years it might have reduced by couple of millimeters, presently that's really starnge :-)
Answers:

What is wrong with my stomach?

No, your penis does not "shrink" unless you enjoy a medical condition (leading to a curvature) or are receiving cancer treatments. It will also judge smaller after swimming.

A male will grow until he is 21 years outmoded. As for the penis, the size is determined by genetics. Medicine will give an account you that you need to linger until 2 years after you stop growing to know what size your penis will be as an adult. So, you probably won't know that information until you are 23. For more info:
http://menshealth.more or less.com/cs/penisheal...

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Does anyone know what this could be?

This is the same question i just ask but maybe i need ask it differently. If your not a virgin are you still?

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