Question

You are definitely not alone!

I have this too. What has helped me is to make lists or notes for myself if it’s something important so I don’t forget.

I struggle with this ALL the time. I can be mid-conversation and completely lose my train of thought. Just this morning I was having a conversation about a realization I had the other day, and mid-sentence I stared off in the distance and said "uhm... what was I talking about?"
It is super frustrating, but I try to give myself grace. My brain is very sleep deprived. It isn't my fault that I struggle to remember things, and it doesn't make me stupid or broken. I hope you remind that to yourself too!
Xoxo/Zzz, Gabrielle

Yes. I ended up finding out I had narcolepsy because of these things. I thought it would be more like ADHD, with having difficulty focus, difficulty with things like - I'll be on the computer and think that I need to look something up on Google, and then I open the web browser and forget why I did it. Very much the thing where you walk into a room and forget why you did, just for me much more frequently.

I have a lot of tasks I feel like I can't complete, and there's no reason I can't - I have time, I have the resources necessary, and then I try and I just kind of can't.

I don't know if this is the same as what you're saying, but I thought maybe similar.