Many years ago, I was at an event or training session or something and they asked us to write down the first three things we identified as - without giving much guidance.
It was an interesting exercise with surprisingly varied responses, and although it's now 20+ years later I still sometimes think about that.
I have been a parent for much longer than you, but I realise that I don't actually think that if I was asked to do that exercise now, that "mother" would be in my top 3. Because I AM a mother, and of course, that's important, but that's not how I see myself. I see myself as a woman first and foremost. By nationality. And as a professional.
Of course, because I DO have responsibilities as a mother, each of these things have to be balanced with my need to consider my children - eg not moving to Vietnam at the drop of a hat - but they are not the drivers of all of my decisions.
I don't know how YOU get to that sort of place in your own head. I do know that I suffered from PND and found the relentless responsibility of parenting insanely difficult in the beginning. I resented it, and DS, endlessly. But as time went by, it got easier and easier to separate myself and to feel like I didn't have to prioritise him (or, in time, them) in everything.