>tfw i've read lots of books but have had a bad memory and no english lit education after 16 (went full stemtard)
>tfw i can barely describe most books ive read
Well first of all you need to read more. Second of all you need to improve your reading ability. Take an easy book and read it. After each chapter read a summary online and try to see what they are pulling out of the novel. This is roughly what you should be pulling out of the text in terms of plot.
After you finish the novel read some short cliffnotes analyses and look at what themes they are getting out the the text. Compare them to your own thoughts.
Ask yourself while reading... What is this novel about? What is the author trying to tell me by writing this story? What are some universal themes in the book? What things have touched you throughout the novel?
It's just because you just read to read.
Try to give some extra thoughts about what you're reading, such as what theme or message is the book trying communicate.
If you read a passage which you found to be nice in some way, read it again.