Confidence is to believe in your own abilities.
How many times have you said the phrase, “I can’t do it," and how many times has your teacher helped and encouraged you and you've done it? YOU have the capacity to achieve, but you often rely upon your teacher to hold the belief.
Let's agree to eliminate the phrase "I can’t" to be confident in “I CAN!”.
Your teacher has confidence in your abilities, and encourages persistence. You should also believe!