This is key. I was born in Italy, but to American parents living abroad — and I don't have any Italian ancestors. I don't qualify for Italian citizenship, because Italy is jus sanguinis, not jus soli.
https://en.wikipedia.org/wiki/Jus_soli
Good job keeping me out, Italy.
https://www.inps.it/pages/standard/51985
Though I'm guessing you've probably spent much more time than me researching this already so this might not apply. Are you back in the US?
Where I live (Canada) it's jus soli and there's an entire birth tourism business because of it. Foreigners give birth here just to give their children citizenship without ever contributing.
Most of the world is jus sanguinis.
Also, you could have obtained Italian citizenship by staying until you were 18.
More of a claim than if your great great grandfathers second cousins babysitters dog once visited on holiday, which seems to the be the basis that many Americans use when they say "I'm Irish".