From what you said, To the surgeons practiced eyes and ears everything appears normal for a male your age.
Even if his examination may have seemed cursory, he was noting your build, musculature, skeletal development (hips, chest, shoulders, hands & feet, face, voice, hair distribution, fat distribution) etc.
I think his conclusion that a you do not need a full workup by and Endocrinologist is probably valid.
Remember that you play a major roll in the success of your surgery. Follow all pre and post operative instructions to the letter and you should have a good outcome.