I think you still have much reason to stay hopeful...In my situation, it seems as though I might be rejected from many programs ranked in the twenties, and was accepted by one arguably within the top ten. As long as you are a good fit for some of the top tier programs you have applied to, I think you have every right to be optimistic about your chances for acceptance. Keep in mind, sometimes lower ranked programs might assume that you would not decide to matriculate if you are an especially strong applicant-this might be the case for you! Stay positive-I am sure you will be surprised by where you will end up come fall!