You describe a fetish that is common among men. It need not cause worry unless it leads you into actions that cause alarm or problems for you or women who are strangers to you who arouse you. If you find that thinking about women's shoes or legs becomes such an obsession that you can think of little else; or if it causes you to act inappropriately to women who are strangers, then you should seek the help of a mental health professional, such as a psychiatrist or psychologist.