No worries. No matter how big the tile is, it’s still much smaller than your floors’ or walls’ surface. So it’s not like a new pair of shoes which may be too big for your feet.
In fact it’s an advantage because you’re using less tile to cover the same space. So that you’ll have lest joints to fill with grout.
This creates a beautiful continuity in your floors and wall. Besides large tiles also yield more cut pieces, so there will be less waste.