Common area for bald spots. Taking in consideration your age and the males in the family being able to grow good beards, it will probably fill in the next years. I've read many stories of guys in the early 20's having a baby smooth face and being able to grow monster beards later in life. Your beard is pretty thick where it does grow and you have strong connectors, which is something a lot of guys in their 20's don't, me included.

While it is obviously good to have a healthy body and routine, its mostly a genes thing. There are plenty of men that smoke, eat unhealthy, drink too much alcohool and still grow amazing beards. You are doing very well for 22, nature will do its thing on the right time, the only thing is: we don't know when the right time is, so you just have to wait.