I can't remember much from last year and it constantly haunted me. Is that an ADHD thing?

A few days ago a friend brought up something we did last month, and it took me several minutes to recall it. That really freaked me out. Looking further back, I can barely name anything specific from last year, even though I lived through all 365 days. Not just last year either. I barely remember much from the years before that, or from my childhood. I clearly lived through so much, the stories are there, I just somehow forget them.

A lot of people here say journaling helps. I tried, but I can never stick with it. I write for a week and then forget the whole thing.

I want to keep these memories, but I don't know how. Is that an ADHD thing? What should I do? Is there any way to fix this?