Against the wishes of her parents (but with their permission), Karen Armstrong entered a convent at 17. Her memoir reveals what being a nun was like in 1960s England--the spiritual, physical and emotional challenges, as well as the joy of feeling called and chosen to strive to be close to God.
From what I understand of my mother & sister's Hindu vocations, the concept of needing to destroy one's own ego and ties to the world, including family in order to be close to God, is more similar than I would have thought for Catholics.
Armstrong is truly a believer, and her story is unbiased. If you pick this book up, and it seems slow at first, hang on until she makes it to the convent.
Recommended by Kate Haas.