Why I have no sensation at all inside my vagina? Even my g-spot. But clitoris stimulation arouse me. I've been like this all my life. Can smone help?

Normal. The G-spot is a myth. Clitoral stimulation is required for orgasm in most cases. Without clitoral stimulation, sex is just not as much fun, for most women, and orgasm is less likely. The vaginal wall has receptors that can detect stretching and with significant stretching, pain can be felt.