Hi Rimi, It would have been nice to how long it had be going on, if its resently, and at the time the sex was a bit rough and dry he may have taken a small peice off the wall of you vagina, not something you can see, so try having some sea salt baths and get the water inside you, sea salt cleans and helps healing, so ite either try this or as Remar ahs said get to a gyno.
Good Luck
Pain lets your body know something is going on. I wish I could tell you what it is but I'm not sure. Can you get in to see your Gynecologist soon?