Put your nerd caps on...
Remember when Harry Potter went to pick his very first wand? Getting your first pair of pointe shoes is kinda like that.
Every foot is unique.
You need a different shoe depending on your strength, flexibility, shape and size. That is why it is important to find a professional fitter who has the knowledge and the selection to accommodate every foot. Finding the perfect fit may be a long process, but once you find "the one," it can be quite magical (I know, nerdiest joke ever).
Au revoir xoxo