We have a natural built-in function to forget
Our brains are actually built to be able to forget. It produces for example a neurotransmitter anandamide, which is a natural cannabinoid that may help us forget things like traumatic memories and reduce stress.
To remain sane you kind of need to forget, as anything else would result in major stressors. What if you could remember every single time you embarrassed yourself like it was yesterday? What if every minute detail and every grand experience had the same weight in your brain? What if every second would be permanently saved for all eternity. It would be maddening.
Hyperthymesia - When people remember everything
The condition is also known as "Highly superior autobiographical memory" (or HSAM for short). People with this condition remember everything, most of the time starting from a certain moment in their lives. For them it can be very difficult to cope with pain, loss or regret. The emotions seem just as fresh and people with the HSAM describe the feeling like having "open wounds", which they carry with them every day.
It can be very hard to forget embarrassing moments. You can’t turn that stream of memories off, no matter how hard you try – Nicole Donohue
How to deal with forgetfulness
You need to remember The brain is for having ideas, not for storing them. You also should try to externalize as much as possible. The more we externalize, the more chaotic, creative and serendipitous other parts of our life can be.
In order to really remember you shouldn't just copy and paste other peoples thoughts as It is important to write in your own words in order to really engage with the content you are thinking about. Keeping in mind, that you will forget most of what we read, writing notes and summaries will Enable your future self to learn from your past self - because your future self will forget everything.