ready to give up?

There have been a few moments in the last three years when I came home from a piano lesson ready to give it up. I tend to get very nervous playing for my teacher, and my daughter likes to point out that I am also sweaty afterward. Yes, I know that, thank you very much. But the worst is when I feel like what I am trying to do is impossible. Once I went and had spent the entire week working on the rhythm in two measures, and had practiced it completely wrong. And confused myself so badly t...