In riding for 7 years, you are still considered a beginner. No offense, but I wouldn't allow my daughter to be taught by someone that young. Even though you are experienced, you are also very inexperienced on many levels.
Most non-horse people will see no problem with you teaching their children, because you have 7 more years of knowledge than they do. However, older, more experienced equestrians will see a problem with it, because there is still a TON you need to learn when it comes to the business.
My advice is to never sell that pony, because he keeps your students safe. Would you know what to do if a horse took off with a student and wouldn't stop? Would you know how to control the situation? Would you know how to talk a student through a bucking spell? How fast could you react? If you already have the answers as to what you would do, you aren't experienced enough. Every situation is different when it comes to students and horses and you have to adapt quickly, because telling them a predetermined plan of action in a real emergency won't work, since everything with horses never falls in a predetermined course. Especially when poo hits the fan.
Keep the pony, don't expect much out of your students. At this age, all they want to do is have fun, and the parents want them to be safe. Your forgiving pony, your arena, and some Instruction will keep them safe. Parents will be happy. Keep the kids smiling, and they will be happy.
And be careful. You are still a minor.