Although giving birth is painful, and we are being convinced of that fact in naturalistic film scenes more and more often, majority of women who decide not to give birth, do not fear physical aspect of it. What they have in mind is responsibility towards a new human being who will depend on them for a very long time. They are aware of their own ignorance about parenthood. No woman in the world knows instinctively what to do with a crying package she brought from the hospital. All women learn as they walk, manage to correct their mistakes and fear about the life of the baby which entered their lives without the user's manual.
Women differ in their relationship toward work, home, family, partners, friends.
They also differ in the ways they fall in love or things they find interesting. By the same measure, women do not feel the same need to have children. Life is a miracle, but different women find purpose and happiness in different things. There is no rule by which we measure what will make everybody happy.