White bumps

Okay so on the inside of my vagina I have all these little white bumps some I can pop like a white head. They arnt itchy they arnt sore they dont change size. I have been to my gp and its not a std or genital herpes/warts. I have only had 1 sexual partner and same for him we have been together 5 years. Does anyone know what they are or have them?