I am 20 years old and barely can grow enough mustaches and beard only a little under my chin and some hairs on sideburns can you help me to grow it?

Low Hair Growth: There is a cream that is used at times to help growing hair called minoxidil. This is a medicine that was used for high blood pressure and it was found that one of its side effects is that it helps hair growing! Consult with your doctor please

Poor beard: I would first look at and talk to other males in your family. And ask them about hair growth at your age. Then if abnormal in your family see a Dr there who can see if there is any hormonal problem. Most likely familial.