According to the recent survey of sexual health centres conducted in Feb 2015, brought to light that the size of an average penis is 5.6 inches(13.8cms).
While this was good news for a lot of men who met the standard sizes, but it made the men who didn't meet the standard size more nervous and unconfident about their penis.
Another survey reports that 4 in every 10 men were not satisfied with their size and were constantly looking for measures to increase the size of their manhoods.
First thing you should keep in your mind that your race is the main standing factor that influences your size.
Here below is the chart which will help you figure out what is the average size of penis depending upon the race.
Now if you qualify the average size depending upon your race you should be satisfied that your condition is not the worst but its not better either.
This chart is just for reference and there is no hard and fast rule as far as penis size is concerned.An Asian can have a 7 inch penis and an American can have a 4 inch penis its just all about luck.