Hi,
Welcome to the ehealthforum and I am really glad to help you out.
Thereâs nothing wrong with the sensory nerves of your vagina. Cervix is not sensitive to the touch or pain as it is bereft of any sensory/pain sensitive nerves.
You need to ask your partner to prolong the foreplay so that you can climax even when heâs on top.
You can keep on stimulating your clitoris during the intercourse when heâs on top and that should help. You should share all your feelings with your partner for a better enjoyment of the sex. I sincerely hope that helps. Take care.