I am trying to use a domain that I buy in Go daddy, to google sites doesnt work

In order for us to be able to help you, it helps to know the address (URL) of your Site, both the sites.google.com url and your custom domain url if you are using one.

For your sites.google.com url, Go to the SIte editor, click on the little downward pointing triangle next to the publish button, select 'View published site'. When that opens, copy the URL in the address bar that starts sites.google.com/view/

See also Sites FAQs - https://sites.google.com/pjrprojects.co.uk/newsitesguide/faqs