I've been around tons of children that have asked me why I don't have kids out of the blue, but none have ever asked me if I liked myself as a kid. And I've never just been casually talking about how I don't like children with a child. ( I actually do like children; but in this situation if I didn't I wouldn't be discussing it with a child) I would answer, yes I did like myself as a kid and then I would redirect the conversation as an adult. I think it's highly inappropriate to divulge into why you don't have kids or like them or not with an 8 year old and really it's no one else's business but you and your spouse's. I actually think it's a rude question to be asked. But, if you are ever in a situation where you are talking with a child about your reproductive choices; you deserve rude questions for being a creep and not having better boundaries to know that you shouldn't be talking about that with a kid. A hypothetical creep, of course.