Finding comfortable ski boots that fit just right can be a challenge. It seems like every time we go skiing, at least one of us has to try several pair of boots before we get the best fit. If you have wide feet, it can be hard to find wide ski boots at the rental shops.
You feel like your feet are squished inside the boot so tight anyway, but if your boot is too narrow it can really be uncomfortable.
If you ski often, I would recommend finding a pair of boots to purchase for yourself instead of renting every time. That way you will know they fit you and you won't have to fight it every time.