I agree with much of what's been said, but I think there is some misinformation in the responses here.
If you are under the 18-21 age bracket, and you are not sexually active, and you have a normal menstrual cycle, then there is absolutely no medical reason to go see a gynecologist or to have a vaginal exam.
However, you *should* get the HPV vaccine, because it can prevent you from ever contracting HPV when you do get older and become sexually active, and that's important, not the least because the HPV virus will increase your risk of cervical cancer (and even it will require you to have at least more frequent exams to monitor in the future - something you surely would like to avoid). A regular doctor should be able to give you this vaccine, you don't need a gynecologist for it.
If you an abnormal cycle that causes you pain, distress, significant bleeding, etc., then you may want to see a gynecologist sooner.
If you ARE sexually active, then you SHOULD be getting regular exams and pap smears, because of the risk of HPV, which can be transmitted from skin to skin contact/bodily fluids, even with the use of condoms,and even women with whom you may be sexually involved could have it and transmit it to you. Most people are NOT symptomatic and many do not know they have HPV.
I agree that at *some* point in the future, you may have to see a gynecologist and learn what those exams are like and what they are screening for, depending on how you approach your transition. But I don't think there is any benefit to having you go now to learn. Most young *women* are extremely scared and uncomfortable about going to the gynecologist, let along young *men.*