Are you sure that's safe at your age? Please be careful.
EDIT: I just looked at your gallery. Please stop doing PE until you are older. You have a beautiful penis. While I definitely don't discourage PE, and have seen it work, it isn't without risk. You absolutely can hurt yourself, and you can cause irrevocable damage to your penis. I say, if your penis works, use it! Don't worry about making it bigger.