Go to the doctor. There are procedures that can be done to make that area more sensitive and to heal. But you will have to an OB/GYN so that you can be referred to the right specialist.
Hi,
I'm not sure if you can do anything to become more sensitive, but I would suggest a couple of things; start using more lubrication, and hold off for a while so the tear can heal completely. If you just can't hold off (and I'm not sure how to put this) there's other ways you can do that without causing the friction. Hope this helps, and good luck to you :)