It should be remembered that adsense is a name of online business. and all businesse, whether online or offline, take time in development. for example if you open a shop, then it is not necessary, that in the very first month, it will give you profit. you may go in loss, in the first two or three months. But if you are having a strong will, and you work with keen devotion, then after six months. this shop will give you a very good profit.
lets have another example, for understanding the nature of google adsense. Suppose you are serving an instiitute. It is not expected that from the very time, you join it, you will be getting a good promotion. But you will be promoted on the basis of the experience that you will be having. similarly adsense is also an online job. All new users get a zero profit, in the first few months. but once a user gets a pay, this process will start. and it becomes an endless process.
I hope you have got my examples and experience. And i hope you will start working on Google Adsense with patience.