It's a guy thing, hey look at me my penis is 8 inches.

Don't worry size doesn't not matter as much as you think also it's something like 5.7 inches the average. Your friends probberly arn't taking the matter serious like you I doubt they are that big.

You'd think so, wouldn't you?

Nah... There's myth after myth after myth about what factors influence penis size.

If a tall guy has a big dick and a short guy has a small one, it's purely coincidental. In fact, I know a very short guy (5ft 3in) who is tremendously well endowed. And I know tall tall tall guys who have 5 inch dicks. All depends on indiviaduals

Don't worry about anything being in the water at your school. Your friends are probably all being a little too generous in their measurements. Here's a chart that shows the average lengths when erect and based on race. You're right where you should be, maybe even a little bit bigger than normal for a 16 year old and you'll notice that self reports are always bigger than actual doctor measurements.
Edit

It is not the soize of your penis, they probably have less than you especially in the brain power and heart power, you probably have much more then they do just een in the understanding department. I am sure that when you are ready you will make a girl very happy just remember to practice safe see by using a condom.
Good luck!
We are here for you.

It is not the size of your penis, they probably have less than you especially in the brain power and heart power, you probably have much more then they do just een in the understanding department. I am sure that when you are ready you will make a girl very happy just remember to practice safe see by using a condom.
Good luck!
We are here for you.

First your friends are lying
second there are diff ways to measure your penis length. The proper way is to grab a ruler and press it firmly on your pubic bone while you are erect. This is bone pressed erect length and most people measure this way however this same process usualy adds an inch to your penis since by pushing down on your pubic bone the tape measure adds an inch or 2. Avg penis size falls within the range of 5.5-6.5 that means that 90% of all men have penises inbetween that length. Do not listen to your friends i've personally caught my own friends lying both about their dick size and their libidos. Sadly men just exagerate it's not our fault it seems to just be in our genes.