how to stop from increasing hieght

Hello and welcome to EmpowHer,
If you are experiencing normal growth then you will probably stop growing soon, since most people stop growing around your age.
However there is a condition called Gigantism. This condition occurs when a person's pituitary gland makes too much growth hormone. Some common symptoms include:
--very large hands and feet
--thick toes and fingers
--a prominent jaw and forehead
--coarse facial features

Fortunately, this condition can be treated if caught soon enough. Treatments may include surgery or medication.
Below I have pasted a link to a HER article that talks more about Acromegaly (gigantism).
https://www.empowher.com/wellness/content/when-your-diagnosis-acromegaly
Faith