Hi,
Welcome to health care magic,
Height is determined by a combination of genetic and environmental factors.
Human growth is regulated by somatotropin (human
growth hormone) which is secreted by
anterior pituitary gland, which gradually subside after adolescence.
Bones grow by contribution of new bone from growth plates at each end of long bones. After adolescence these get ossified & there after no further growth is possible.
Thus height of females or in case of males, stops to increase further at the age 16 to 18 years and 18 to 21 years respectively.
I am sorry, to say that as you are turning to 18 years old, no further increase in height is possible but there may be some chance to improve your height for which you can take healthy diet rich with calcium.
However, some orthopedic surgeons or hospitals claim to increase the length of bones by applying traction and thus height but all these are related to bone itself.
Hope, I have answered your query.
Take care,
Thanks and Regards,