Not sure how old you are but this is a common problem for those raised in the internet age. Because of the flood of visual stimuli constantly hitting us, our brains grow accustomed to "viewing" and lose the skill of "reading."
The difference between the two is that viewing involves the eyes detecting images that immediately connect to concepts and feelings stored in our brains...Reading requires the additional step of words being processed by the brain and translated into concepts and feelings. It is the difference between being handed a paper airplane that only requires tossing for enjoyment and being handed a sheet of paper and instructions on how to make a paper airplane.
In our visual-dominated age, our brains are trained to see words as "images"...and rather boring ones at that since they usually don't immediately trigger strong feelings...the effort required to process those words causes fatigue, which we feel in the form of "boredom."
The trick is to 'exercise' the brain and get it in the habit of processing words as words again. If you have a favorite book from childhood, I suggest going back and reading that...even if it's an old picture book. Or read the book form of a favorite movie. The point is to get the brain to connect the act of reading with those pleasant memories you already have stored. As the brain makes the connection between reading and pleasure, reading becomes less of a labor.
Don't be afraid to start gently. A few pages a day or, as I said before, a child's book is a good start. I do suggest reading off actual pages rather than an electronic screen....again, our brains are so accustomed to receiving anything on a screen as an "image" that I find it difficult to gain pleasure by reading literature off anything but paper.