You are ONLY 21. Be patient. You will likely mature significantly over the next 5 to 10 years. In the meantime, eat healthy, work out in the gym with weights and don't obsess about things outside your control.

Patience shall be rewarded!

New beard growers: Check out the Rules of Beard Acquisition.
To upload and post pictures, here is a tutorial.
Do you believe in these Common Beard Myths?