don't be so hard on yourself. I agree with the others. I like that, 'when you know better, you do better", I too pulled dd out of preschool last year. She stopped wanting to go, and when I had originally signed her up, I told myself it was for Her, and meant to be fun, so if she wasn't having fun, there was no point to it, and it could possibly damage her view of school long term. Anyway I just stopped sending her. On school mornings I would ask her if she wanted to go, she never did, except on the last day, there was a school picnic, and I did take her to that. I read a lot that summer abt unschooling and hs in general, and we plan on doing this indefinitely.
Don't feel like you have to "prepare", or follow the school's schedule. If you want to stop now, and they do too, then do it. It will all work out.
Of course you didn't do permanent damage! This is all a part of life, trying things, making mistakes, ect. Nobody is perfect. You a re trusting your instincts now, that what counts. I remeber after I stopped sending dd to preschool, I posted on unschooling.com message board abt it. I was so happy and excited, but scared too. someone wrote back along the lines "well, now you will have to undo every moment of the damage school has done to that child. It all must be undone" I was looking for support, but got the opposite. And this was from a highly respected unschooling mom on the site. I was really hurt, and spent a lot of time worrying abt what I had done to dd. Eventually I realized that nobody is perfect, and I believe every decision is made for a reason, and can be worked for good. Maybe it was good for dd to see what school was really like, so she wont romanticize it. Maybe it was good that she made the friendships she did at that time. Maybe I needed that yr in school to open MY eyes abt the whole education system, and led me onto my own homeschooling, educating myself journey. My point is that you really cant say what good or bad this year has done, instead focus on the future.