I think, first of all, you need to start with what you are really interested in. You can even try comics (read Neil Gaiman, for example).
Now, as for the action itself. Try to set yourself a condition - I will read for 5 minutes. You can set a timer. The main thing is that you need to focus on one specific case. Without any distractions by gadgets, long looks out the window, etc.
The trick is that it will be easier for your brain to agree that the unpleasant (for now) business will last only 5 minutes. And there, look, and get carried away with reading.
I would like more input. Have you, in principle, tried to read multi-page folios of pages so for 100-200? What kind of literature can’t master (scientific monographs, florid detective stories, non-fiction, fiction)? What exactly distracts you: gadgets, pets, relatives, the weather outside the window, finally? Or just a lack of focus and concentration? The crazy thought comes that it's boring? In any case, it is worth gradually increasing the volume of pages read day by day, as well as minimizing external interference, and transferring the smartphone to vibration mode, disabling sound notifications from applications that are tied to data transfer. In addition, I recommend trying exercises or games to train your memory, because they just in the good sense of the word will add to your patience.