Not remembering this event

I (24F) recently just remembered that I attempted an attempt at 14. The details of the event and what lead up to it are very hazy and unclear. I remember I took a handful of paracetamol and woke up confused and vomited so much.

I was incredibly depressed during those years and have gotten better at coping with life as opposed to then. What freaks me out is that I had essentially no recollection of this event AT ALL until I read about it in a journal entry. I’m freaking out now, especially because now I wonder how many other things I have forgotten. I know I’ve forgotten a majority of my childhood and teenage years. However, how do I not remember this at all? What’s wrong with me??