Thanks for writing to health care magic.
Since you are 21 year old I do not think there is any chance for increase in height. So please do not fall pray to any advertisements or any thing which suggest that there is a chance of increase in height after medication etc.
I request you to not to get depressed and stay in a positive frame of mind.
So do not worry and concentrate on the good things you have and the positive aspect of yourself.
If you cannot then consult a psychiatrist
Hope this helps.