This guy was orbiting so strongly that he changed his religion before they were even dating. But I do believe in modern prophets and that God gives no commandment that is not for our own happiness. I'm sorry this was so longwinded and not really an answer to your questions. Several of the apostles have grown up in part member homes. There is still a chance you can work out your differences, but it will require major concessions on both sides. Is your spouse willing to give you up on Sundays, and half your weeknights. Their values and the values of popular western culture are wildly disparate, which can be tough for them to navigate early in life. While it's true that Mormons are not one-dimensional and completely predictable, the odds of a successful relationship, given the OP's description of his girlfriend, are slim.
Mormon girls are the best, and you are pretty lucky. There is still a chance you can work out your differences, but it will require major concessions on both sides. There may be underlying personality similarities, but if the answer to "what shall I do next" is always trumped by a Morman frame of reference for one partner, but not the other, conflict is inevitable.
He has spent years building his practice and is a busy, highly successful pediatric surgeon who is compassionate and respected by everybody, but I think by nature, it is hard for him to be empathetic or to relate to more personal issues. I am married to a DH and what helps me the most is knowing my whole life revolves around him and medicine always come first. I'm the wife of an intern and we try to make a night each week to go do something, just the two of us.
But, I am a 3rd year medical student and my fiance is a 2nd year medical student. Since her father is a bishop, I'm sure he'll want to have his daughter marry a temple worthy person. Especially if they're devote enough to expect you to marry in heaven, huge implications with that one. If your relationship has gotten very serious, your girlfriend will probably try to find agreement in your faiths. However, I did not expect my role in marriage to end up what it has become. Does your new girlfriend have eight brothers and sisters.