You didn’t do anything wrong. You were upfront and honest and there is a therapist out there who will appreciate that and be happy and able to work with you.
I am sorry that you felt so rejected. She could have handled it better if she did not feel like she was a good match for you.
I overwhelmed my therapist too on my first meeting but she felt able to help me. It is not a reflection on you that this therapist does not.