Loss of Feeling in Genital Area

Hi, I am a survivor of a Malignent (sp?) brain cancer which I was diagnosed at Age 12 and finished receiving my treatment at ager 14. Went through Radiation and Chemo therapies and will be considered cancer free in Janurary (I am now 20 going on 21). My question today is I am a female and for the past few years I have been having sex with my partner I can barely feel anything in my vagina, whether it be a finger or the penis. This is really frustrating to me and until recently I told my partner about this. I am wondering if this is a sideeffect that may wear off, if there is medications or if this is something I will have to live with. Any help is appreciated, thank you in advanced.