Worried about my ECs

So, I’m a 17 year old student, currently living in a small city, located in Brazil. And after comparing myself to other international students applying to Ivies, I am feeling like garbage, hahaha, I did nothing like volunteering work or starting a campaign. Here’s what I did:
-won a bronze medal in OBM, the national math competition held in Brazil
-won a gold medal in a math olympiad hosted by ETAPA, an education group.
-won a silver medal in a local Futsal competition
-won a silver medal in a Writing competition, in Japan;
-Became the teaching assistant in Chemistry and Math in my school;
-Lived in Japan for about 9 years
-participated in school’s presentations, doing things like singing, dancing and reading a poem, once;
-3 years of Spanish;
-4 years of classical guitar classes, also played in a concert once, and will again in December;

  • Self-taught English (I don’t know if this has any impact).

Besides these ECs, I have a GPA of 4, and am the first among a class of 34 students. My SAT II scores in Chemistry and Math 1 are 690 (Which I plan to improve) and 740, I still haven’t taken the regular SAT. Do you think I have a chance at all? the summer holidays are coming, should I do something during that extra time?

What colleges are you seeking? It sounds as though you have a very unique life story, which will certainly be interesting. However, it is much more difficult for international students to get admitted to top universities than domestic applicants and even then it is still extremely competitive.

My dream is to enter one of the Ivies, what do you think?