Worried about girlfriend?

me and my G/F are both 18 and gave our virginity to eachother but when we have she feels nothing but pain. before i enter i make sure shes wet and i also use lube. but she still fells pain she says its not to bad and that she can handle it. she cant seem to feel any pleasure either. iv tried oral but she still feels noting. she gets wet and stays wet the intire time but only feels pain and not pleasure. i know im new at this but this doesnt seem right. she says she doesnt care about the pain. am i doing somting wrong or is it somthing we need to see a doctor about.