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I already looked in the google code library, but I did not find anything that could be useful to me
From your question, I think Google Maps JavaScript SDK is the most suitable platform for you to start building on top of.
Of course, Google Maps will not provide an out-of-box solution for custom requirements, but it can help you get started.
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In it I must insert an interactive map of my country, that is, anyone who enters the page must have the possibility of creating marks, polygons and adding names within the map.
This is so that each person delimits their own terrain and keeps it there.
Do you mean like creating a dynamic map (not the map that we have of Earth), and allow people to create their own areas/regions?
In that case, perhaps a more 3D rendering software can help you—
something like WebGL, etc. But I'm not sure if that will help you since your question/requirement is unclear to me.