Hi Liz,
Just want to encourage you today. I totally understand this feeling of discouragement. But, I want to encourage you that I am seeing fruit of the homeschooling venture, and I believe you will see that fruit too. It may look very small or insignificant at times, but I can assure you that it will grow as you continue to point your children to Jesus as their all-in-all. One thing I tell my children is that I love them and do the best I can, but I make mistakes. Yet, Jesus never will make a mistake in their life. He loves them beyond their comprehension!
Tonight, my oldest son came in my room with a little notebook/journal he had found from his first grade year when he was in Christian school. He showed me a page where he had drawn something and had written a sentence or two, like, "My favorite thing to do at school is go outside."

Then, he showed me a tiny, little sentence scribbled at the bottom in small letters. It said, "I love you, Mommy." My son told me, "When I used to be at school, I would miss you so much, and I would wish I could be at home with you again. I would write things like this on my paper when I missed you." Then, he gave me a big hug and said, "I don't want to go back to school anymore, please Mom." My heart was being rent in two as he spoke. The thoughts of my precious son missing his mommy like that was so precious and so sad to me. I assured him that I didn't want him to go back, and that I hoped we could always homeschool. He gave me his signature smile and said, "You're the best Mom." (Mind you, this is a boy who had to get 2 spankings today, one for pure foolishness and one for attempting to cheat on his multiplication tables

) But you see, it is far more important what is going on in his heart and in our relationship that anything else.
So, be encouraged. We all feel like failures much of the time. I know I do. But our Father is SO gracious, and often pours out His grace on us even more through our children. Homeschooling is part of my process of sanctification, and it is painful at times, but I believe that it is conforming us more and more into the image of Jesus. And He is doing the same in our children's hearts as well. This is not an easy journey to travel, but neither is it easy when they are in an institutional school either. Life in general, no matter which path we chose, would not be easy. Following Christ is not easy, but there is great JOY in this journey with Him. He is worth it ALL. He is worth giving our very lives for.
Love and blessings to you in Jesus Name.