I think it's probably a normal thing. Women all have maternal aspects. So do men, for that matter, but it's more obvious in women. As we grow up and grow older we explore those, not necessarily by having actual children, but by exploring our inner selves. I've had maternal fantasies as well as real life situations in which I expressed motherliness many times in my life without ever actually having children. Also wrote stories in which the main character was a mother. It's part of being female. It can also symbolize creativity. I can remember lots of times in my life when I dreamed at night of being pregnant or having a baby, when in reality I had something I needed to express creatively, something that I needed to nurture and bring into the world. And maybe the world making is about a need to understand that you create your own reality. Each of us does.
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Female
INFP