This is the absolute worst, isn't it? I happen to think that I live a perfectly valid lifestyle and the choice not to have children shouldn't effect how people see me, yet it does. I've been saying for years that I don't want children and I always get that same reaction from people that you described and it's exhausting to deal with. It's gotten to the point where as soon as the topic is brought up, I do my best to change the subject because it's just not something I feel I need to justify on a near constant basis.