Suggest Treatment For Vaginal Pain During Sexual Intercourse

I am a 25 year old women...i got married in last month...my weight is only 45 kg..my husbants weight is 80 kg....our problem is painful coitus...his penis is very big....i cannt tolerate the pain..we consulted a sexologst and he adviced us to use ky jelly....but that is not reducing my pain..we consulted another doctor and they instructed me to do hymenectomy..even now his penis is only entered half to my pussy....what are the remedies for this problem