Thanks for your query at DoctorSpring.com
Your concern is basically because of boyish face with less facial and body hair.
I don't think you have any hormone deficiency if you have regular erections, sexual feelings and libido and are able to masturbate.
You have a body-image issue for which building up your physique will help. Please do not take any hormone supplements or muscle building drugs if offered to you. such drugs can make your sperm production and testes function go low and affect your marital life. Also, they can affect your general well-being.
you can take whey protein supplements with muscle building under a proper trainer. that will help.
also, participate in some sporting activity, develop hobbies and avoid getting obsessed by your body image.