For admission purposes, you will be compared to Italian applicants that year with a general baseline based on the country’s system and their own record of past Italian applicants, which is why it’s important for us to know how you compare to other students in Italy (nationally or regionally). Then for financial aid you will be among the domestic pool and not subjected to the dire restrictions internationals face.
In addition, because languages are in sharp decline (unfortunately) applying for a language+sth major -which would make total sense for the liceo you’re attending - is a huge boost to your application both for admission and for preferential packaging where that is practiced (like AU).
AU, GWU, CWRU are need aware so they may or may not work for OP financially.
However, having advantages (international curriculum with US citizenship, high grades, uncommon major combination as long as OP is willing to be strategic) could tilt things in OPs favor so I think it’s worth a try.
If OP is strategic applying to a language+X major, universities where you apply to the whole university and can freely explore and switch majors (such as LACs, CWRU…) would be of particular benefit to her.
You do not need to take the SAT - Italian students are in a type of curriculum where their scores don’t reflect their strengths because they’re used to writing long essays or taking oral exams that are like grad school Comps in the US. That’s probably why standardized tests aren’t really offered.
Your ECs aren’t very competitive. Not sure what you could do though. They’re solid but not wow - that being said as a domestic applicant you don’t need to be an Olympian to get into some of these colleges so the bar isn’t the same, the activities either need some external distinction or to be more original. Additional issue, the hours you need to spend at school leave little time to do much more so you’d need to refocus one activity or find a way to amplify it.
Of course nothing is easy with universities that are highly selective or need aware but I?m sure OP knows she’s not a shoo-in anywhere 
We need to know whether OP would be Pell eligible - hard to tell because the lowish income announced in the original post doesn’t mesh with parents providing 30k a year - being able to pay 30k a year would place someone in the top 5-10% Italian salaries.
If OP is Pell eligible it’s an additional incentive for admission.
If not, NPCs are going to be crucial: Boston College for instance calculates need by placing a huge penalty on equity/owning a house, so OP’s house’s value (or if her family rents).
(For American readers: OP is studying English and Italian at high, well post-AP level plus 2 foreign languages&cultures/literatures at AP level, and has level 2-3 in Latin on top of it. However math, physics, and natural sciences are only part of a Gen Ed curriculum at honors level.)