The 31-year-old TV star - who announced she was separating from husband Kris Humphries after 72 days of marriage in October - always dreamed of having a large family but is now worried she won`t ever become a mother and may have to settle on being a "good aunt" to 23-month-old nephew Mason, her sister Kourtney`s son.
Kim - who has five siblings and four step-siblings - said: "I always wanted what my parents had. And at first I was like, I want six kids. Then I went down to four, then I was down to three, and now I`m like, maybe I won`t have any. Maybe I`ll just be a good aunt.
"At this moment in my life, I feel like maybe I`m not supposed to have kids and all that. That`s how I feel. Maybe my fairytale has a different ending than I dreamed it would, but that`s OK."
Following her marriage split, the sexy socialite - whose mother is Kris Jenner - now believes she needs to be a "little more realistic" about her expectations for life and of men.
In an interview with America`s Glamour magazine, she said: "I`ll always be a hopeless romantic. It means that I believe and love and the dream of having a perfect relationship, but my idea of it has changed.
"I think I need to not live in a fairytale like that. I think I maybe need to just snap out of it and be a little more realistic. What I want isn`t possible."