Joining the club here. Had to "work" for 9 years, medically speaking, to have my first child 14 years ago, so I couldn't see, after all the effort, sending him off to someone else every day while I went back to work. So DH and I decided I would stay home, even though it HAS been a sacrifice financially.
I wouldn't say I'm the best SAHM, but I think I've been of some value here. I think the family has been spared a lot of the stress involved in two income families, where there has to be far more "negotiation" regarding household duties and the children's doc appts. or school events. DH has been able to get a lot further in his career than he would have with split priorities. I don't necessarily make a nice dinner every night, but enough so that the kids think Kraft Mac and Cheese is a treat.

My house is not the perfectly clean SAHM ideal, cause I still hate housecleaning. But it's walkable, doesn't smell, and I never leave dishes overnight.
DH was laid off last year, and it was very scary, there being only one income. He worked pretty much full time at finding a new job, but meanwhile I thought it might be time for me to look too. I felt as many of you do, underskilled and like no one would want me. But I actually did get an offer at a FED EX store. Not exactly a super high paying top job, but not totally without future possibilities. My volunteer work in the at home years actually had helped me a lot in the interview (3 years doing the school yearbook, PTO secretary, school newsletter, etc.). So when she asked me to name something I would call creative in the past year I was able to say I put an online yearbook together for a school of 500+ and wrote a monthly online newsletter complete with writing, gathering, and adding graphics to articles.
But then DH got an offer, and it requires A LOT of hours and total flexibility. We tried to figure how to work my part time job in, with the hours they wanted me to work, and neither one of us are ready for DS14 (with Asperger's) and DD11 to be home alone for hours after school. They would also have to give up most any activity, unless I start mooching off of other SAHM's time. So, I am continuing to stay home for now. I earn little bits of money from working parents who need someone to take their kids to school in the morning or pick them up, and from helping the home daycare down the street.
I do still want to plan for the future, and obsessively think about what the heck I want to do when I grow up.
It's helpful to read other's similar experiences so thanks for this thread OP and contributors.
