Ok I'm 16 and my penis is no larger than 1 in and when erect its 3-4 inches l.I have pubic hair but no armpit hair or facial hair, will my penis grow?

See below . You may have what is not uncommon and known as constitutional delayed puberty: a delay in the onset or physical maturation process that occurs during puberty, but which otherwise ultimately ends with normal maturation including penis/testicle size and body hair disrubution. Other less common causes. Recommend you talk to your parents about seeing a pediatric endocrinologist for proper evaluation. .