i was a voracious reader as a child who fell off of it mostly due to health issues as i grew older rather than school taking the joy of it from me. i used to read a ton of YA as a kid, manga as well although i still read manga pretty regularly, and when i got older and wanted to pick up reading again, i picked up a YA novel since that's what i enjoyed most as an older teen.
big mistake!
turns out my interests in reading material had changed over the years without me noticing because it wasn't a skill i felt the urge to nurture for a long time! so i ended up having to start branching out and exploring new genres to find what i like nowadays which turns out is mostly non-fiction and romance. i never finished the YA novel and ended up beating myself up about it a bit.
which brings me to my advice.
like the person in this thread said earlier (im so sorry, i can't remember who), don't be afraid to not finish things. take your time and if you need to borrow it from the library (my current easiest way to read) over and over again, then do it. there's no shame in taking a bit longer to get through a book or even just putting it down because you decide it isn't for you.
branch out! if you're feeling stuck or paralyzed with choice, i like picking something i thought i wouldn't be all too interested in from my list. if it turns out i'm NOT all that interested in it, putting the book down helps me narrow down my choices a bit, and if it IS a book i'm interested in, it helps give me a bit of insight into what im enjoying at the moment and what sorts of genres/etc i should be seeking out to get my reading desires fulfilled.
really i think reintroducing ourselves to hobbies just requires a lot of patience and being gentle with ourselves. especially if something like school or health made it difficult to keep up with your love of reading (or whatever hobby for that matter). i found myself wanting to jump back in at my teenaged reading speed, getting multiple books read in a week and tearing through the library, but it took me about a year to read my first book getting back on the wagon and i LOVED the book! it's helpful to remind myself that reading speed is a skill that you have to practice to get quicker with it most of the time.