Your doing the right thing man, Your at a good age to start too (not trying to push you into it).
Doctors are terrible these days.. He shouldn't feel hesitant at all to do it.. its your choice and you want to get your health checked.. (No doctor should refuse anything like that).
I seriously think there needs to be a Law which doctors have to carryout any tests that a patient wants to know about his health.
I would take doctors to court and sue them if i could, most of them are so arrogant, augmentative and ignorant because they think they know everything because they went to a medical school.. Half the people on this Forum are smarter then doctors..
When it comes to Steroids anyway

Which is why i love this forum so much.
When i was younger, i had allopecia and i didn't go to school because of it.. when the doctor was giving me injections in my head..
He did about 10/18 injections.. Soft and nice
Then he asked and i told him that i quit work and left school because of my allopecia (I was only 16) and he started getting really nasty with the injections.
I still to this day have a really sore lump from which he injected to hard into my scalp.
I was a kid, and my whole head had patches of missing hair.. i looked like a leopard and he got pissed off because i didn't work or go to school because of it so he started making the injections really hurt me.
I also had to get a tooth pulled out from a dentist without any Anesthetic and i told them to stop and they kept going.. I was actually screaming and squeezing the chair
I wish i was the dentist so i could show them how much that hurt.
I had gas.. but it didn't help at all
Also, your probably best bet is to ask around at your gym for gear.
There is always cops at the gym, so don't talk to loud and make sure no-one is listening.. I got this one-guy who comes up-to me and starts saying he wants to run Sust/Tren/Deca loud as f**k.. i have to tell him to be quite every singletime.. (hes been saying he wants to get on gear for 3months.... Wannabe)