Do you really "forget" things?

Do you really forget things? Or do you just say you "forgot" because it is easier to say than to explain that you were stuck in ADHD paralysis? I found i do this pretty often apart from stuff i really forget, as it is just easier to say i forgot than to go into long explanations on what ADHD paralysis actually is. Most "normal" people simply can't understand why i can't "just get up and do it".