Getting properly fitted footwear takes more than picking a shoe off the shelf and having the sales associate ring up your sale. Be sure to have both feet measured.
Many people have feet of different sizes.
Have your feet measured each time you purchase shoes. Your foot size changes with age, weight changes, and other factors. The shoe size you wore in high school probably is not the right size. Have footwear fitted at a similar time as when you will be wearing the footwear. For daily footwear go when you've been on your feet all day your feet have expanded.