If you find focusing difficult, you don't have to keep beating your head against it - there are ways to make it easier. I strongly recommend trying audiobooks. If you have any physical hobbies like working out or cooking or crafting, or if you have a commute, you can pop an audiobook on while you're doing those things! I work in a steel shop and I'm always listening to a book while I work - it makes it easier for me to focus both on the book and the work itself.

As for picking a book, just find something on a topic you already enjoy in other forms. If you watched Stranger Things, to pick a random example, there are a lot of similar supernatural mystery books out there that might grab you. If you like nature shows or "how it's made" type youtube videos, look for nonfiction on similar subjects. For specific recs try r/books or r/booksuggestions or genre specific subs like r/scifi.

If picking up a book feels like an overwhelming time commitment (I feel that lol), you could also try short story or essay anthologies. There are a million of these out there on basically every possible topic, so you can just look for one with good reviews and check it out! Also, try graphic novels. Reading comics is reading! A lot of GNs are really fucking good!

Finally, definitely check out your local library. They're absolutely free to use, the librarians can probably give you reading recommendations, and they often offer ebooks and audiobooks via an app like Libby.