The average person with ADHD has received more than 20,000 negative statements before the age of 12 so… Yes.

If you were always told you are doing something wrong then naturally you will feel like you are always doing something wrong. It will become a core value/belief system by the time you are an adult.

https://www.mdedge.com/psychiatry/article/23971/pediatrics/dont-let-adhd-crush-childrens-self-esteem