First Dr. Appointment & don't know what to exect?

I'm going to be turning 21 soon and have been putting off the idea of going to the gynecologist for the first time for a pap test because I have "self-diagnosed" myself with what I believe to be sexual aversion disorder. I get freaked out when anyone, including my boyfriend of a couple years, touches me sexually. I don't know how to come out and tell the doctor this right away before he starts the exam. Please keep the rude comments to yourself. Thanks for the help!