How do i know that I have shit discipline or I have ADHD? My

What disorder do you think you have? Or rather what disorder do you WANT to have?

There are an astronomically small amount of "mental disorders" that have provable causes and provable effects and become provably deteriorating. Mostly just schizophrenia. For the rest of us "disorders", it's really just a matter of what we do and how we want to interpret those things. You can interpret them in terms of "personality disorders and government-recognized diagnosis." Perhaps those things are even useful to some people. Study of the patterns of behavior that people who "have similar conditions" might be quite enlightening. Or you can interpret them in terms of what you are and what you want to be. Do you have ADHD? If you want to, then sure. What do you do with that information? Well now that's the far more interesting question, isn't it?