Am 21yrs old am not dat tall wat can i do to get taller?

See your doctor: Your doctor can check hormone levels and other things concerning your well being. If your parents are not tall then it can be normal to be short. Otherwise at this point your growth plates are likely closed. I would suggest seeing your doctor for more complete exam and information. Good luck.

Nothing: Unfortunately at 21 years of age you have likely reached adult height. Ultimately genetic plays the most powerful role in determining your final adult height. Of course good nutrition, lots of sleep, and a nurturing environment as a child can effect total height as well, but in your case there is not much chance you will get any taller.