Author page

Hi,
I just typed the name of my new website to google just to see if it started ranking already and I sadly discovered that first page that is ranking is mydomain/author/admin which leads to a page where all my posts are. On my WordPress site, there is not such a page like author/admin so I cannot delete it or at least fix the awful url. 

I have never experienced this on any other theme and so I don't know how to fix it. Could you please help?

Thanks 

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