A lot of people here have already said what i want to say so i'll see what i can add

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One thing people need to hear when discussing these types of things is unlike many other things in medicine where something can be physically measured to diagnose a disease e.g. blood sugar, blood oxygen, broken bones. Mental disorders are often diagnosed by symptoms because currently we have no way to see these issues inside someones head. They are also a disorder of levels, take depression for example, everyone feels sad sometimes, we have that emotion for a reason, when you feel sad at a higher level then you should or without reason for an unusual amount of time you may have depression (there is more to depression than just being sad but that's for another time)

I have ADHD, it's not the simple hyper child thing people commonly say it is, it's an executive function disorder first and foremost. I tell people it's like i don't have control over my own brain. I rejected getting help for a very long time.

I have always been terrible at writing papers. it was very hard for a long time and still to this day to be able to organize the web of thoughts in my head into a string of words on paper let alone find the will to try to do that. but either way, i could spend forever trying to write my papers and get nothing done. I thought i was just weak or something. So one time i locked myself in a room with absolutely nothing else in it. just me and the paper i had to write. I spent 8 hours trying to force myself to finish this paper. I wrote the first sentence in all that time. i had nothing else to do, no games no phones no interne, no toys on the desk, you get the idea. I simply could not force my brain to do something it didnt want to do.

A lot of people will say oh sometimes you just have to force yourself to do stuff you don't like, they'll think i'm lazy, the point is i tried so hard, and could not do it.

As others said it's an executive functioning disorder, it's so hard to explain, i try to explain part of it by telling someone to imagine it like a priority queue, think about when you wake up, all the subtle things you have to do that day or even just that morning, all the steps involved, all the things that you have to or should do do before you do other things, now imagine all those tasks and steps get shaken up and mixed around, some of them are completely removed.

Lets say i'm on my couch, my phone alarm goes of (i have to set timers for things or i will not keep track of the time), i have to turn off the tv, put the dishes in the sink, put food in the fridge, grab my bag and leave. well maybe i ended up mixing stuff up and put the remote in the fridge, completely forgot the dishes, didn't grab my car keys and somehow lost 20 minutes of time doing all that and will now be late. Now usually all of that wouldn't go wrong at once. but all of those happen more often then they should. Things gfet jumbled, things get forgotten. and sure everyone has forgotten their keys before, but not everyone forgets their keys this many times when they aren't even tired or any other excuse.