CHANCE FOR UIUC???!!! (in serious need of help)

This might be really unfamiliar to majority of you guys. So I attend British international school where we do IB (no gpa nor ap). And im graduating from my high school in 2017. I seriously want to study in UIUC as a general studies major (but in the essay, I will explain how I’m conflicting between economics and civil engineering); and I serioulsy need advice or clarification whether I can get into this school

IB (predicted so far): 38
New SAT (my old sat results are just hopeless): 1410
Math 2c: 750
No idea of my class rank
Experience:
Year 9&12&13(we do in “years”, yr 13 = gr 12)- form captain
Year 10&11- charity manager
School Badminton team (captain)- Yr 9,10,11,12,13
School Basketball team (captain)- Yr 11,12,13
School Swimming team- Yr 12
School Javelin team- Yr 11
Model United Nations- Yr 11.12
Baseball- 4 years, nominated for all star team
Founder of the baseball organization (both school and country wise)
Coach for baseball team- 2 years
Korean school service- 4 years
James Law Architect Inc internship- 1year
School renovation committee
AYP ( Award for Young People)- Bronze
Vietnam facility service
and there plenty more which I just cant be bother to write hahah sry

Though I am setting my major as general studies, should I explain that I have ambivalent passion for both econ and civil engineering in the application essay? Because I know UIUC has insanely high reputation + requirement for civil engineering, would my acceptance rate diminish if I were to write this major for my considering major? (hopefully it makes sense hahah)