I have always been scatty and forgetful, even when I was a kid. It was a running joke in my family that I would lose something the minute you gave it to me, or go out wearing mismatching shoes. or forget things I was told. People thought it was because I was laid back, but in reality I found it hugely stressful to always be late, or always be rushing, or not have the right stuff with me.
So when I was about thirteen, I made a HUGE effort to become more organised. I wrote stuff in a diary, made lists and looked at them every day, got in the habit of checking the calendar, etc. I addressed my natural untidiness and kept my room clean (not all the time, admittedly, but I stayed on top of it). It worked*. Now the running joke about me is that I have a "daily goals list" and am always pathologically early to everything.
The point is that, if you KNOW that you lose things or forget things, you need a system. It's your responsibility to find ways to deal it. There is no such thing as a "naturally organised" person just someone who has put effort into not being disorganised. This goes double for people who suspect they may have a condition that makes these things harder for them you need a strategy for dealing with it, not just to vaguely hope that other people will understand.
*Did my parents recognise and applaud the new me? Did they bunnies. I'm in my thirties now and they still treat me like the scruffy, scatty eight year old I used to be :)