We are childfree by choice as well. Based on my upbringing and some cultural factors, I kind of struggled with the "decision," - maintaining for a long time that I was "50/50" about having kids. In reality, I just needed to give myself permission to (what I thought would) disappoint my folks. They ended up being so supportive. And I have 5 sisters and a brother having babies, so there are always kids around.
There is a book I read as I was mentally/emotionally working through it - Two is Enough. I love it because it has survey data and interviews from almost 200 couples about their decision process, life now, fears (if any), etc. I loved the different perspectives. The author divides the childfree up into 4 categories that I see represented throughout this thread: Early articulators (know early they never want to be a parent), Postponers (who keep putting it off, but ultimately decide they are happy without), Acquiescers (who were neutral, but defaulted to a partner's stance) and Undecided (those who To-Date are childfree by choice but openly state they may go either way in the future). The book is respectful of all and I loved it - not to mention I got to breathe a huge sigh of relief at the end feeling like I no longer "had to" have kids. It took me awhile to verbalize, but now I am happily and respectfully open about it with anyone who asks when the babies are coming. They aren't.
Edit to fix typos, though I surely left some.