Many years ago (in the late 1950’s), during pre-marriage counseling, my wife and I were advised by our priest that any sexual act between married couples was mutually agreed upon was licit as long as it ended with the male partner ejaculating inside of his wife’s vagina, Any purposful male ejaculation outside of the vagina is a mortal sin.
This advice is still in effect to the best of my knowlege. I don’t know where you live, but there should be a Catholic social worker in your area who can advize you where you can get gynecologic care if you are not covered by health insurance and cannot afford care. There are very few places in the US or Canada where you cannot find care if you need it and cannot afford it. Your Pastor should be able to refer you to a counseler. All you have to do is look!. Internet forums are most definitely not the place to find solutions to such delicate and personal problems!