You're WAY too young to be doing anything other than masturbating; that's the only form of PE you should be doing for the next couple of years. If you start doing PE at such a young age, when your body is bursting out in growth with all kinds of changes, you will be quite likely to end up with the complete opposite of what you came here for. For the moment, focus on building your body with a solid routine of exercises such as push-ups, pull-ups, chin-ups plus some cardio like running, jump-rope, swimming, etc. Also make sure to eat tons of good, muscle-building foods and get plenty of sleep. By doing this, you will maximize the benefits of all the hormonal changes that are starting to take place at this quite precious time in a young man's life, where your muscles grow like it's a joke, which will help you start out with a solid foundation to carry you for the rest of your life. By doing this now, you penis will benefit of the abundant amounts of Testosterone flowing through your body, which will make it grow as much as it can on its own while you're developing. Once you reach the age of 18, you'll be at the tail-end of your development, which will be a safe time to start doing PE. If you take the risk of starting PE at such a young age, you will most likely hurt your dick in such a way that might be beyond repair. And trust me whn I tell you that you DO NOT wanna go through life as a man with a broken dick.:ranger:

