If wrong notes hurt your ears, good.
A student of mine was whining about that once. He was 11 years old, and he had pretty good ears. I was pushing him a little bit out of his comfort zone, and he started complaining that his ears were hurting when he played wrong notes.
I didn’t want to back down, because I could see that we were on the verge of a breakthrough, and I was eager to press forward. But, then he began screaming.
“I can’t stand it!”, he cried, covering his ears.
I was reluctant to take a stand, with him getting so agitated, but somehow I forced myself to do it.
“Put your hands down and listen to the sound coming out of the piano, and tell me that it really hurts you.”
He did as I said.
“No, it doesn’t really hurt…“
So yeah, there may be pain. But it’s not from your ears. When you learn to love those wrong sounds, your ears will feel much better.