If the HPV vaccine had come out when my daughter was a teenager, I would have gotten her to the doctor's office so fast you couldn't see us for smoke! As the science regarding this vaccine gains more knowledge, it will affect more of the viruses. I would want all my girls protected from whatever virus there was!
As the giver (and receiver) of about a million injections, shots are about as painful as the receiver makes them. Relax and breathe deeply. Then your muscles will not be as tight. If the shot goes in the hip, bend slightly and take your weight off the side the shot is going into. Same for the arm. There is, admittedly, a bit of expertise in placing and injection, so if the person about to inject you has hurt you in the past, ask for another nurse or for the doctor to do it. But, as I stated earlier, your amount of fear and muscle tension will guarantee that's it's gonna hurt!