Puberty/Testosterone problem

Patient : Im 19 years old. Im 6\'3 but only weigh 140lbs so im very skinny. I also have no facial hair and people mistake me for a 16 year old rather than 19. Is this a result of my genetics or could it be low testosterone?
Symptoms:  No facial hair
no weight gain
trouble building muscle
child body
girl trouble
Images: 
Puberty/Testosterone problem-1
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