how do i know that i am getting paid every time someone clicks one of my adds.
Not all ads pay by the click. Some only pay per view, and, some ads that do pay per click may not show a value if the click is considered invalid, so essentially, you may not get paid for every click.
If the pub-ID in the adsense code belongs to you, then any clicks you receive that are considered valid would be shown in your adsense account. If your Adsense account is showing impressions and clicks, then the ads are working correctly.