YTA, but so is she.

See, this is something you two should have discussed before getting engaged. By expecting her to just go along with your traditions without objection, instead of discussing it with her, you are officially the asshole. Open conversation is what makes relationships of all kinds work. Expectations only lead to disappointment and conflict, neither of what you want in a marriage.

At the same time, however, she's the asshole for disregarding your traditions. It is clear she failed to read your book, which should have been obvious is important to you. After all, it's a book about your culture and traditions. If she was serious about the relationship, she would have at a minimum read the book. She then should have brought up her questions and concerns so you two could have a serious discussion about what you two are seeking from this union and how to best please each other. Compromise is how to make marriages work.

In my honest opinion, this sounds more like a marriage of lust rather than love. Should you go through with the marriage as is, I would be surprised if it lasted more than a couple years. My advice is to sit down with her and have a long and serious discussion to work things out. Should you two come to an agreement and go through with the wedding, then may I have an invitation? I'd love to be there to... erm, witness the special occasion. Thanks, and I wish you both the best!

Sincerely,

Blade