Mrs Ho, i would suggest for you to use a lubricant during sexual intercourse. it will helps a lot. trust me on that!
you could easily buy it everwhere.
however, do take note on the ingredients as some of it will actually tear off the
condom, especially the cheap and unknown brand. so the safest choice would be Durex and KY Jelly.
also..as for the pain, besides the dryness, perhaps you are not arouse enough and the vagina isn't relax to fit the 'big' penis. some people are just naturally dry.
besides using lubricant, you can also ask your guys to go down on you first, make you relax and wet before him entering you. that's why foreplay is very important.
well..hope it'll help.