Don't get frustrated. Keep going, treat every failed interview as a improvement in your experience. Believe in yourself that you will find your dream job.

你应该想以前的面试都是为最后那个最好的offer打基础的。

我觉得没有面试机会是最惨的，就象我现在这样

我认认真真的找了大半年工作,连phone interview都没有.这跟专业很有关系的.现在我已经去做又苦又累的post-doc了...

it's really normal. just regard every interview as a practicing opportuntiy. It will help you to be relaxed and perform better.

and you need to review what u did right and/or wrong after each interview and think about how to improve...

Good luck,