Hi, I had this problem when I was eleven, eventually it developed to such a stage that everything around me that wasnt within a few metres also became blurry, I can't blame it on reading though but that was how I first noticed it and i have been wearing glasses since, so going on 25 years now.
What some of the others have said is really important, every 20 minutes or so, try to look up and focus on whatever is the furthest away from you for a couple of minutes at least in order to give your eyes a break and use a different muscle for lack of a better expression.
Might be worth getting an eye test as well, just to be sure.
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