I'm 16 now. I have no reason to believe that weightlifting stunts your growth. A friend of mine told me that his doctor said weightlifting can only stunt teens with weak bones growth. I don't know if this is true or not, but this is what he told me. I also have a very low percentage of body fat.
Creatine does work to build muscle.
I got stretch marks near my armpits because my arms grew from 14 inches to about 16 inches in less then 5 months. Weight lifting won't necessarily stunt your growth, but it is essential that you are very careful as your ligaments and tendons are still attaching themselves to your bones. I am fifteen and have made the mistake of lifting too heavy weights before I should have. My advice is to wait until you are fully grown and developed and then go for it. If you don' t want to do that, then keep your weights at a low poundage and go for high reps.