At your age, you will not be able to increase your height. You have reached the maximum height you can reach. Height is determined by various factors like how tall your family members are, how tall your parents are, how was your diet as a child and teenage years and how much physical activity you did then. For now concentrate on maintaining a healthy diet, regular exercise and positive attitude. It may be of interest to you that people of less height dont loom their age. They always look quite young! Enjoy that.