About books and memory

I'm afraid worried. Some time ago I noticed that I'm afraid worried for my memory. In my childhood I used to study learn many poems by heart. And I was so proud of my memory because I could remember more information (I mean poems and some texts in studybooks) than other people around me. I red read a lot of books about all everything. Now I'm studying in at university and I became have started to read less than before because of my studying studies and job. And I have noticed that I have forgotten the books which I have read. I don't know, maybe it's usual situation for all people. the same thing happens to everyone. Maybe it's a problem of long-term memory or short-term memory. After all, I red read some essays of the distinguished author P.Zuskind; he wrote that he can't remember any information from books a month after reading them. The only good thing got saving for me. It's is his statement that books are not for memorizing but for making us better. It's amazing for to me how some people can remember all the details and names of heroes who were are in books. But I know that the experience which I get from reading is valuable for me in spite of everything.