I have numbness and no sensation in my G-spot, what is wrong with me?

I have no sensation inside my vagina. I can feel my finger for instance going in but I cannot feel anything pleasurable. My clitoris feels fine upon stimulation, however, I get absolutely no sexual sensation inside my vagina, particularly the G-spot. What is wrong with me, and how do I fix this?
Age:24
Female
Medications: abilify