J.C.
I started getting yearly paps done at 13 so yes, for me it was normal for the doctor to look at my vagina. Many young teens become sexually active around the ages of 13 and 14 and things like birth control need to become part of the conversation. I find it odd (and unlikely) that they did not explain any of it to you though before hand. If this story is actually true and events happened the way you claim, then I would find a different doctor. But it is normal and needed for doctors to take a quick peek, that is how they can determine if the genitals are healthy or not. How many 12 year olds would really know if something was wrong or would feel comfortable asking if something is normal? Not many, which is why the doctors need to take a look.