Im from sri lanka. 17 years old. i feel like my penis is small. it's 5.9 inches long and has a girth of 5.2 inches. is this too small? how to increas

Normal: This is normal. Don't fall for the sales pitches for products that will supposedly enlarge the penis. Anything that could truly do this would be risky. The truth is that it would be very hard to do, and you will likely waste money trying to make a normal penis abnormally large. I'd advise you to stop looking at it and focus your mental energy elsewhere.

Penis size: re penis size - common male concern. Here is some general info - some good guide to what is normal and your numbers sound quite normal. http://www.netdoctor.co.uk/conditions/sexual-health