I'm 19 years old but my beard is not growing. Please help me - what to do and how to do it?

For a good answer, its best to submit a questions as thorough as possible, provide pictures and descriptions so that the community can better answer your question. The cause for your lack of growth could be hundred of different reasons.  Did you have growth before and not now, are you losing hair from your beard, have you never had a beard?   Each will require different interventions.

Beard transplants are very effective if performed correctly. Some men will have thick beards in late teens others wait till their 30's. We have most men wait till age 30 or older as a thin beard usually thickens up with time and you may not need or want a beard transplant if it rectifies itself with time. I  perform beard transplants on younger female to male transgender patients to improve looks of masculinity.