14cm is normal! You can't enlarge your penis permanently by yourself only by surgery.
with a pump you can enlarge it only temporarily for an erection.
your below average. they do make a device that stretches the penis over 6 months.
I don't know what TN73 is referring to. The average penis is 5 inches (12.7cm). And a woman's cervix is a maximum of 6 inches long (15.2cm). So, you are very, very normal and there is much need for an enlargement.