Sadly European isn't a country and entry to thailand is based on passport nationality not general area where you come from ๐
If you showed up here without ANY visa and were stamped in free for 60 days you don't have a tourist visa, you don't have a visa at all, all you did was get a free 60 day entry on the visa exempt entry program
You can extend that one time for 30 days at the immigration office for 1900baht
In bangkok IF you have a free stamp entry (your stamp will say เธ.60-เธก.17) you go to the immigration office at IT Square Laksi Plaza at this address
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This is a general list of the requirements to get the extension. There are copy/photo shops next to the immigration office in that building