You don’t need permission to study something. Libraries don’t check whether it’s “your subject.”

Somewhere along the way school starts sorting people into types, and you can end up believing that chemistry belongs to the chemistry kids and poetry to someone else. No such rule exists outside a timetable. Nobody at a library desk checks your transcript before handing you a book. The only gate is whether you decide the thing is interesting enough to spend an afternoon on.

Pick the subject you have quietly wanted to know about and borrow one book on it this week. Read fifty pages with no plan to be tested. Notice how different studying feels when nobody assigned it.