Just some input here--you are doing a wonderul job and do not doubt yourself for one minute! None of what you are doing (raising your children, raising the skids, etc..)comes with a "manual"-you do the best you can.
Personally, I'd hold off on the college class thing if this is for credit or future career move--added stress.
There's no reason to not delegate more responsibilities to the children---for their own things and for the good of the family. There were 6 of us in our home and each and every one of us pitched in regardless.....if you should, God forbid, get sick or something, they would have to help, right? My mom came down the pneumonia right after she had the last babies-twins (I remember doc coming to house!) and the 3 oldest boys were responsible for cooking, cleaning, laundry, and their homework, etc......didnt hurt them one bit (dad worked 12 hour days).
Oh, and no such thing as allowance for us either--we just did our chores.
We also never had babysitters---but, after our chores were done (summer time, weekends), mom always took us somewhere. Now of course, we knew how to behave and watch out for each other..and it was always some place free.....but I think that was my mom's way of "getting away" without really "getting away"--know what I mean? ANd, with the added incentive of a trip or whatever, we always got our chores done. She did this with 14, 13, 8, 3 and 1 yr old twins to travel with....I remember "cleaning" my own room up at 3 or 4.....
I do remember, on occasion, one neighbor lady watching us---with her kids too--and then my mom would do the same for her once in awhile....is that an option for you?
Stop being so hard and demanding of yourself~
*come back to chat soon too*