Hey dude! I would want to say: yes you are overthinking it!!! For three weeks, your beard already rocks.. Going to get even better coming month(s). You have a goal on how long you would want to grow it? Also.. Why are you worried about the greys? Multicolored beards are good ones to start.. With a bit of added grey they actually add character, of course that's my opinion

Live Long and Bearded!