I'm in the same boat. Im 28 years old and female. I always knew I didnt want kids since I was a kid. When I told my mom this, she said I was too young to understand and would change my mind. Well low and behold I have not changed my mind, decades later. But during this time absolutely everyone in my life and demanded that I have kids. I dont understand the obsession. Not every woman has a natural instinct to reproduce, contrary to popular belief. And people need to just mind their own business in the first place. I cant stand it when they say I will change my mind. I am a grown woman, I am pretty sure I know myself and what I want. And if I do change my mind, that's still not anyone's business but my own. My best advice to you is to learn to ignore it and let it go or else it will drive you completely insane. I let it drive me insane, and now I feel very upset with certain people because of it. You know it's not their business so dont worry about it.