Seems unnecessary to 'identify' with such a thing.
Any combination of want kids/have kids/changed your mind? is pretty much a day-by-day thing. Trying to put the label on yourself just sounds like you're still in high-school. I try to learn things about people through dialogue and possibly cyber-stalking, not through whatever jumble of words they've used to try to carve out an identity (their usually wrong, poseurs, or just confused). Any time something is spun in to a label/movement I have to wonder what other motives are behind it. You don't have kids. I do. That may change (for either of us, really). At what point is it no longer a mere statement about your current state of being, and instead some thing you're trying to adhere to?
Whenever I think of identifying with a particular thing, I can only think of a bunch of ways it gets misused. "Does anyone else identify as masculine?" -- at what point does that stop being a mere observation about the fact that you cut down trees and kill animals for sport, and start preventing you from enjoying something else that is not 'identified' as masculine? That's a fairly common stereotype and it is so because it happens, a lot.
Is it possible that you're attempting to simplify some part of your self-discovery by picking up terms? Might I suggest that you don't bother - for all the time I spent with a mohawk and a trenchcoat and concerning myself with which music was "real" and what wasn't, it really doesn't amount to anything. You can wake up one day and like pop music and cashmere sweaters. Who you are has noting to do with what you like, and that includes children or the fact that you currently don't (or do) have them. Is it sensible for me to identify as "pet-free"?
The term might also be there to help you feel alright with your choice in the face of pressure. I don't know where you live, but I've never encountered anybody that wasn't a stupid drone that actually thought you had to have kids. My parents wanted grand children, I told them there was absolutely no way, ever, that they would ever see a living creature related to me. A few years went by and I changed my mind. Other than that (and they're not exactly open minded people), everywhere I go it usually goes more like "Do you have kids?", "No, I don't", "Oh, okay" - not "What? How come? You're so old!" and so on. It goes the other way too, "Hey, do you want to get together Saturday?", "Sorry, I'd like to but I have something planned with the family.", "Oh, okay then." ... simple. I've only ever heard the complete dredges of the cubicle farm even begin to make those kind of judgmental assertions, and those are far from their only transgressions of close-mindedness. So my point with this, is, if it is about feeling 'depressurized', are you sure that it is even a real thing at this point? If so, then don't surround yourself with those people. I don't know any parents that think having kids was mandatory or their best idea. It's a compromise of values an ideals. The only time it becomes a problem is when either side attempts to assert that they're somehow superior for their decision.