So, I married a nice Catholic lady and I couldn't be happier. Our daughter is the most adorable toddler that has ever existed and we have a boy on the way. Her parents are strongly Catholic, in fact they are members of the Secular Franciscan Order. They are great people and our relationship is strong.
Happy to chat with you about any of the related issues - marriage, child baptism, meeting the priests, what do do when they chant prayer before dinner, etc.
If I may be so bold, I fear your biggest problem isn't her, it is your sense of shame, like you have done something wrong. You haven't. You just have a wildly interesting history with a strange religion. Own it, laugh at it, stop being scared of it.
Everyone knows I used to be a JW. I mention it often. At work I might say, "Well, if I could sell the WatchTower I can easily sell that!" Sometimes I just make a joke like, "When I was in a cult we used to...". The reactions are loads of fun.
Think of all the awkwardness that came from denying participation in everything as a JW. This is way easier.
Don't let your own shame sabotage this relationship. I recommend you work on self-acceptance and change the narrative you are playing in your head. When you tell more people and they, astonished, ask you questions about all the stuff you did and you bring up the crazy stuff you believed, you will start to reduce your shame and will realize it is just an experience. It is just what happened.
