> Did you have something that gave you a lot of fulfillment before you had kids?

Yes, and I still do. I am a soft dev, so job is quite fulfilling, I also like mountain hiking, friends, etc. But having a kid is something different, it is just not comparable regarding the level of satisfaction. For me the relationship with my kid is the most fulfilling thing a world can offer. (But of course I wouldnt believe that before I had one)