i have the opposite issue. im an ugly ethnic so i would get mistaken as 20 even at 16, despite subpar beard genetics. its so crazy i got all the terrible genetic traits, without any of the possible good ethnic traits (long eyelashes, beard, positive eyebrow tilt, high cheekbones, hazel/light brown eyes) despite both my parents having atleast one of these (except for the eye color)
But heres the thing man, no testosterone matters as much as the one you got in the womb. Nothing will make up for it. I am sorry. Even if you hop on steroids. Also facial hair has little to do with your actual serum/free testosterone and everything to do with your follicular DHT levels which depends on how much your body converts free testosterone into that specifically. It is not an indicator of your overall testosterone levels.
Obviously, any bio/endocrinology nerds correct me on anything I said, I would love to learn.