Alice had got so much into the way of expecting nothing but out-of-the-way things to happen, that it seemed quite dull and stupid for life to go on in the common way.
Alice has become so accustomed to unusual and extraordinary things happening that she finds ordinary life dull and uninteresting. Her expectation of constant surprises makes the normal course of events seem boring and unremarkable.
This shift in her perspective highlights how her imagination and sense of wonder have transformed her view of the world. The quote emphasizes her longing for excitement and the contrast between the extraordinary and the mundane in her experiences.