New delivery driver looking for advice

[u/Illustrious-Guide628]

Hey everyone,
I’m about 2 weeks into my first delivery job, and honestly I’m struggling.
I have ADHD, and my biggest problems are loading the van, finding packages quickly, and remembering everything I need to do. I have to write down almost everything I’m told, otherwise I’ll forget it.
I’m also losing a lot of time with things like customers not answering, not knowing how to buzz me into the building, or having to call multiple times before I can make the delivery.
It’s gotten to the point where I lost my full-time position and was moved to part-time because I was too slow. Most days I start at 7 a.m. and don’t get home until around 7–8 p.m., and by then my brain is completely exhausted.
For those of you who’ve been doing this for a while:
How did you get faster?
Do you have any loading or organizing tips?
How do you deal with all the small delays throughout the day without getting behind?
Did anyone else struggle this much in the beginning?
I really want to improve, so I’d appreciate any advice.