Hello Renu
Frustration comes along with competition prep. However, this has to be your decision. If you are passionate about becoming and think that you will eventually make it through then you must keep preparing. On the other hand, if you think you have had enough then take a deep breath, relax. This is not the end of the world, and there are a lot of other career options that you can pursue. In other words, you will have to keep a clear mind and decide what you really want.
Good Luck!!