However, around six months, when he started to be able to actually do things for himself, like hold his own bottle, I started to feel a shift. Now he's 15 months old and I completely understand what everyone means when they say "you'll never love anything more." Being with him is the most heart-breakingly beautiful part of my life and I wouldn't have it any other way.
All that said, I firmly believe that kids aren't the only, or even best, path to fulfillment for everyone. In fact, I still don't really get the same sense of accomplishment from raising him that I do from my work. And I'm sure if we didn't have him, I would be able to do some other amazingly beautiful thing that helped other people or just made me happy.
This is all to say, don't write anything off, even if it feels like a mistake for far longer than you think it should. Sometimes doing something just because someone you love wants it so much more than you can turn out better than you expect. On the other hand, finding someone who wants the same things as you can turn out just as good. Be open, that's all I'm trying to say.