I realize that labor is going to be so painful, but I am inclined to think that someone that young hasn't really experienced that much in life yet and is scared out of her mind as it is. I too am scared, but if you go into it realizing it is going to hurt...bad...and you are totally ready for your little baby to get here, I think it will make a huge difference. Best of luck :)
With both deliveries I wasn't in "real" pain until about 5 cm or so. Before that the contractions are pretty manageable. Yes they are painful, but the epidural helps and your body adjusts. Don't worry. Your little bundle will be here soon.