Pressure on your feet can cause major damage to a Diabetic, so be sure to buy shoes that are exactly the right size and have cushioning for your feet. There are even special shoes made for Diabetics that have specific features which are of benefit to sensitive feet like yours.
A tip to prevent or manage diabetes is to eat high-fiber foods such as whole grains as much as possible. Processed foods, including white bread, have a high glycemic count due to being full of refined carbohydrates and these can increase the diabetes risk. This is because they lead to spikes in the blood sugar levels whereas the more natural the food, the easier it is to be digested.