A lot of parents really, really like having kids. The ROI on having children is, for them, so self-evident that they don't really think about it. But that's not true for everyone, esp. if you were old enough to be pretty fully-formed by the time you became a father. Kids come at a huge cost. You're exhausted from dealing with them, and in the meantime you're probably not exercising, and you're eating like crap, and, inevitably, just plain getting older.
Step 1 is to reconcile your ideal of who you'll be in the future -- what job, how smart, how influential, etc. -- with the resources actually available to you now. I had to downshift considerably.
Your kids aren't going away, and you're not going to be able to sustain what you're doing now until they get old enough. You need to make a change, and soon, because if you don't you're going to end up wondering how and why you mortgaged your life to your goddamn kids.
I have three boys: 5, 8, and 10. For my first six years of having kids, every time someone told me to "enjoy them while you can" I wanted to punch that person in the throat. I knew they were right, but there are days when that's just not even in the realm of possibility.
There are a lot of parents who are tired, and sick of walking on dropped cereal, and miss being able to pick an actual restaurant that serves actual grown-up food. But there's also a huge societal more to not talk about it, or to aways end with something like, "But it's so worth it," or "It's the hardest job I've ever loved," especially for women. But while it's almost certainly "worth it" for the majority of parents the majority of the time, there are going to be days when it's just NOT.
The cliché is that "The years are short, but the days are long." It's true. In hindsight, the fact that I have a ten-year-old seems insane -- how could it have been ten years? What the hell have I been doing for the last decade? Do I even remember life before kids -- what it was like to just have a wife, to set my own schedule?
At the same time, every night at 6:30pm I find myself asking, "How can it only be 6:30?"
I spent a good number of years just basically resenting the crap out of my boys, which is about as healthy as you might guess. I hated dealing with my kids, hating myself for hating dealing with my kids, and knew I'd hate myself later for not enjoying the young-kid experience while I could. I, my kids, and my wife all suffered.
Now I've got therapy and some drugs and a CPAP, and things are better. Not every day, but most days. Well, many days.
Kids completely take over your life, at least for a while, and it's almost impossible to see the light at the end of the tunnel. Your job -- your JOB -- is to figure out how to enjoy them now so that the sacrifices are worth it to you.