I felt this myself, despite the fact that I have three young children, one still in (cloth-)nappies, I am homeschooling my six-year old, I am in the process of planting a permaculture garden on our 3 acres block and grow almost all the vegetables we eat, I bake all our own bread, I cook from scratch every day, and I have no grandparents or other relatives around who might be able to look after the kids for a couple of hours so that I can get a break.
Of course you can now say - well, that's your choice, so just stop whingeing and get on with it, or get a proper job! Believe me, I tried. For a while (when I had only two kids) I was teaching part-time at the university. Financially, this made no sense whatsoever - I ended up being worse off by the time I had factored in the cost of child-care, petrol and parking.
Continued by Chervil at Green Living.