I am 21.1 years old male having height 5.2 (156cm).i want to grow taller. Is it possible if yes what shoud I do??

Likely nothing. A very few people continue to grow taller in their early 20s. If in the last two years you have not grown any taller, then growth hormone will be useless. It will only make your bones grow wider, as bones lengthen at the ends when the epiphyses are open. Once the epiphyses are fused they cannot grow longer.if this is causing your psychological pain I strongly recommend that you see a psychologistif this is causing your psychological pain I strongly recommend that you see a psychologist to help you get to the bottom of why you so much wish to grow taller.