Why does my foot always hurt on the heel that turns in?

More info needed. To receive an answer that will be more helpful for you, you need to give more information...Your health status, any problems such as gout, diabetes or blood pressure concerns. You should state how long it has been a problem and what you do to make it feel better. Also tells us what it looks like. Is it discolored, swollen or point tender. The more you tell the better the answer.
Depends on certain. It depends on where it is on your heels. It may be certain shoes, sneakers, or bare foot. You also may be suffering from plantar fasciitis.