Lots of people are asymmetrical, so its not remotely abnormal. I have been told that leg length discrepancy starts to get really significant when it's about 20mm or more, so 1-2in is certainly in that category. Orthotics can make a real difference but there's more to it - muscle development etc. On the plus side, if you get orthotics you should be able to use them in neutral shoes. Good luck & don't give up.