It is possible for you as a Catholic to request a dispensation from the bishop, through your pastor, to be married in a non-Catholic church for good reason. Anti-Catholic in-laws is sometimes a good reason. It would be considered a sacramental marriage, and be recorded in your sacramental records at the parish of your Baptism.
However, for that dispensation to be granted, you and your fiance still need to prepare for marriage in the Catholic Church. You need to learn what matrimony means, and demonstrate that you will live marriage according to the teachings of the Catholic Church. In other words, your preparation would be no different than a couple getting married within their Catholic parish.
This period of preparation is also a good opportunity for you to grow in understanding, practice and appreciation of your Catholicism. Let being Catholic mean something to you.
Make an appointment with your pastor now to discuss this with him.
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