I am 12 years old and I had my first period a few years ago. On average, I may be considered as tall but I have friends who are 168cm and above. I am only 159cm and I feel very short, so I want to grow to 168cm. I can be patient to grow until 168cm so it is okay if the method to grow taller will take a long time. Please be very specific in the method to grow from 159cm to 168cm in the shortest time possible. Thanks in advance!