If you think you need orthotics, you ought to talk with an expert about it. You may, or may not, have a leg length inequality that should be accomodated. I suggest that you speak to a doctor about it. Specifically a podiatrist (foot specialist) or a chiropractor (posture specialist). Both of these professions require advanced doctoral degrees (eg: a B.A., and additionally, a four year doctoral degree).
-Dr. Tom Morison, chiropractor