I context of ADHD self is your consciousness trying to use your brain to do stuff other people do in their daily lifes while brain is refusing to properly listen to those actions even when you can physically do them and have time for them. It's called "executive dysfunctions" and the more severe ADHD you have the more those executive functions become disabled. Medication helps with that but depending on what you take the side-effects are a real bitch to your body and mind. Hope this clarified things a bit.