I think that was a powerful realisation you had. I have the same experience at times with my therapist. In the beginning I only heard my perception of what she said and took it as the truth but now I can ask her - "this is what I think you are saying, can I check it is right?" - that helps me. And sometimes I do pick up correctly on some underlying feelings beneath the words so it helps to talk it through because it is hard when someone says one thing but the emotions underneath it don't make sense!

Btw my mum said that exact statment to me once when I was a teenager. It made me feel really awful too. Tbh I understand why she said it to me because I was an awful critical spiteful teenager...but it really hurt at the time! Sometimes I wish that she would have stopped and asked herself and me why I was so horrid as that would have been helpful to me. I knew something was wrong but not what...but after that I felt it just confirmed that I was wrong. She has apologised since for saying this which has been helpful for me - maybe you can talk to your mum about it too?