I was in a similar situation. I have 3 kids now and I didn't think at the time when we started having kids that anything was gonna work out.
My wife wanted to stay home so... that complicated things. We just had 2 kids... My father always taught me that in a family it is ultimately the man's responsibility to provide and I didn't think that was fair.
But I decided to give it a go and see what happens. Years later I am glad I rolled with the punches because our life is drastically different from what I envisioned.
Life gives you what it gives you. You gotta tell yourself that you are gonna conquer this thing and stop thinking it is unfair. Start a business. Make more money other than doing what is traditional or what you know. Invest in education for yourself that isn't traditional. Pick up a trade-- there is no shame in it. A painter friend of mine makes 250k a year painting houses. I have painted with him and made 400 dollars in 3 hours of work. It isn't hard skill-wise but it is hard work. Easy money, hard work. If I didn't have my own business I would easily be doing that.
What I am trying to say is I have an ecommerce business and work from home because my wife wanted to stay home. If I didn't embrace the challenge I don't know what I would be doing right now. It is all because of her.
I had hell when I started out and you will too.
Let the pressure drive you to push yourself outside of your comfort zone. You don't know where you will end up.