Self esteem

Its heart breaking when you see how little a person only 8 years old thinks of himself. Right now Cody's self esteem is at an all time low. Sadly he has been branded a bad kid who is too hyper as many ADHD kids are. He now thinks everything that goes wrong is his fault. It really breaks my heart and i am very emotional about this topic. I know he is different, special in my mind is how i look at it. It's hard for me to watch something simple as an argument really get him down. A lot of kids can shrug off a disagreement in minutes. It takes Cody longer and he feels like a failure all together. I am sure he will start adjusting as he is continuously exposed the daily disagreements he may encounter and the everyday small failures but its hard to hear from his teacher at school that he cries in class when he gets overwhelmed because he wants to do a good job but is afraid he will fail. What do you do when your child has no self esteem? We are doing our best to reassure him that he does many things well and that everything that goes wrong is not his fault but that failures are very normal and that it is part of learning to survive in this world. It still breaks a Mom's heart to see her son's heart breaking. I think I have sheltered him too much as he's been growing up. I guess the Internet will be my best friend over the next few days to find a way to solve this issue.