What you wrote here is true for every parent. I breast fed till my son was 3 months old. I wasn't producing enough for his hunger.
My 2nd child, first daughter, I lasted maybe 3 days. It was so painful. So very painful. I was crying and I had the nurses check to make sure everything was right and it was. She had such a suction and thirst. I tried to deal with it as much as I could. My toes curling in pain, my body was tensing. Nothing like my first child. I was almost yelling out in pain. But I still felt bad that I couldn't even last the 3 months I did for my son.
For my 3rd child, it wasn't as bad. I lasted 2 months I think it was. It just became difficult and once again I couldn't produce enough. Very frustrating.
But all in all, the kids are healthy. They grew, they crawled, they ran, they learned. Most of all, they loved. It was beautiful and it still is.
As you end your post with blessing us, I wish you the same blessings along with the strength to carry on. It really is hard being a parent. <3