Why some people find it hard to read a book?

Modern distractions , such as social media notifications, provide the brain with more interesting rewards in the form of Dopamine release. This makes reading comparatively seem boring and less interesting.

The short attention spam many people developed can prevent them from focusing on a book or even a page for long period of time.

When a person reads through a long chapter he might get no sense of progress as all pages might look the same. If the chapter isn't devised properly into sub sections then a person might fail to continue reading.

Technology has changed the minds of people to make them want things fast. Because books usually take some time before they make their point clear many people lose their patience while reading.

When a person reads a lot certain brain connections are developed to help them read fast. People who don't read a lot might find it much harder to read because of the lack of those connections.

People who have dyslexia have problems reading or focusing on text. Those people can find reading very hard.

Impatient people can find reading harder as they just want the facts directly without having to read through different chapters to find what they are looking for. (See Why are some people impatient?)

The internet has taught people to scan articles instead of reading them. This taught people to look for the information they want fast while skipping a lot of text. Books are full of text and so became an unpleasant method of information collection.

Some people get bad feelings when they read books because they remind them of school years where they were forced to read things they didn't like.

Technology has made the environment very distracting that it became hard for a person to focus for a long period of time on a book without being distracted.

People who have a good background about a topic will usually be able to read a book about that topic much faster. When people choose books they aren't interested in the reading experience becomes unpleasant. (See Why reading makes you sleepy?)