I ' d tell you to grow up , but you ' re probably afraid of heights . Now , go back to your corner and continue chewing on your toenails . The adults are talking . <| sep |> Did you have any signs of ADHD earlier in life ? Many of us are diagnosed late , but when you reflect back you can see that the signs were always there . There are plenty of resources for what ADHD looks like in childhood . I remember crying when I read them at 30 years old because it was basically the story of my childhood . Look into the signs and symptoms of ADHD in children and ask yourself , honestly , if you relate to any of it . Parents are often useless when it comes to seeing what they don ' t want to see in their children . So forget about what your dad thinks and continue seeking professional help . I graduated from college without being diagnosed and did fail just one or two classes here and there , so again , your dad is clueless .