I just brought up a subject similar to yours a few days ago. It was about being too hard on myself. I stopped working on the quilt for a few days, looking at all the replies and then going back to look at the quilt.
I then decided, from all the encouragement I received that I was not going to tear out the tiny mistakes. I will go on and try to do better the next time. Sure enough the next row, was much, better and I only saw a tiny mistake where the corner was not exact, but, after tying the quilt. No one will notice, and the quilt is given in love. I used to want to be perfect in everything I did, but, it can stress you more, then just letting the small things go.
The quilt is beautiful by the way.