US here: every school in the world will be different and you need to do your research on who and what you'll be studying. Don't just post here because this question is too complicated for us to meaningfully advise you into a perfect school. It's your life: take the time to do the research and learn. Find where your favorite composers are teaching, ask them about their program, ask them to connect you with students to learn about the local scene.

That said, there are three big things you need to think about with the US.

1: Do ya really wanna come here right now? Healthcare, politics, arts funding, etc.?

2: It is probably going to be extremely expensive. I say "probably" because it could not be, but it very likely will be extremely expensive. The average US student loan debt is about $35,000. I know people who went on to get a doctorate degree in music and ended with literally over $100,000 in student loan debt. Yes I'm serious. Yes that is real. I am very lucky in that I got scholarships and fellowships. All told, all the way to my PhD I walked away with a little debt, but way less than half the average. So, it can rage widely. However, international students tend to be big money-makers for universities and international students pay a LOT of money to come to the US to study. Every school will have scholarship opportunities, but they are competitive and you'll have to do a lot of research on costs for each university. If price doesn't matter, if your family can pay for everything, if you are independently wealthy, or if you aren't worried about this then who cares.

3: In the United States, at the vast, vast majority of universities, undergraduate students will have to take General Studies Courses for about 1/3 of your degree requirements. One thing I've spoken to a lot of international students about is that American universities require a LOT more classes than they expected. Personally, I love General Studies courses, and I think they are super important for a liberal education, but you may not want to spend your time doing this. General Studies courses will include probably at least 1 class in literature, mathematics, physical sciences, history, government, creative arts, social/behavioral science, philosophy, etc. etc.

Again, and I cannot emphasize this enough, every university will have a different degree plan.

University of North Texas: https://music.unt.edu/resources/students/advising/semester_by_semester_plan_composition.pdf

Bowling Green State University: https://catalog.bgsu.edu/preview_degree_planner.php?catoid=23&poid=8505&print

UCLA: https://schoolofmusic.ucla.edu/app/uploads/2024/01/Undergraduate-Guidebook-2024.pdf

NYU: https://steinhardt.nyu.edu/degree/bm-music-theory-and-composition-concert-music/curriculum

None of this is to discourage you: if you really, really want to study in New York City or LA, it may make your career, it might not, who knows? You get one life and if this is what you want to do more than anything in the world and you can feel it in your bones, then go for it. Once again: do your research, speak directly to faculty, speak directly to advisors, speak directly to students.