If you want some hope :

Me at 19yo :

image

It's maybe not easy to see on this picture, but from what i remember, i had really something similar to your current growth.
Anyway i guess i had like 2-3 weeks of beard here.

Today after 4 weeks without shaving on cheeks :

imageimage


The part which is missing on your beard was the last one to appears on mine, without real vellus hair here before.

I'm quite sure your beard will be really great during your 20s, and even more after.