How can you be shorter?

How tall you are is determined by your genes. There is no food, drink or shoes that will make you shorter. My guess is that you are fairly young and feel tall compared to your peers. This will fade in the next few years and you may or may not be taller when you reach 18. People do get shorter as they age, but this only happens when they reach 70-80 years old. Be happy with who you are.