Hi @user_743245, here are my two cents (keep in mind this is not objective and the admissions process is unpredictable).
- Your grades seem fine, nothing incredible. Specifically, some importance might be placed on what IB subjects you chose (e.g., which ones are HL or SL?). SAT 1500+ would be expected and top 20/400 could be a little low for top ivies (emphasis on 'could'). Since your academics aren't your hook (i.e., no IMO gold medal/Science Fair win/Significant research/etc.), you just need to pass a barrier to prove that you can handle the intellectual rigor of Princeton or Yale classes. If you want some numbers, I'm guessing 42+ IB predicted, 1520+ SAT, Top 10/15.
- It's great that you've founded different clubs/projects but you're gonna have to show a lot more here. This is to say that your ECs must have weight behind them -- anyone can start a club but not many can start an organization that delivers water to 20,000 kids. If we're gonna be harsh, MUN for two years/rugby are pretty useless if you have no leadership role there.
- It seems like the Chemistry research you're doing is quite interesting -- hopefully you build on that and maybe mention it in your essays. At a glance, you don't have any significant hooks so your chances will depend heavily on your essays/recommendations/profile. I don't know much about you and a Lithuanian vs. a kid from Singapore/someone who grew up homeless vs. someone who had every resource will have very different chances.
Conclusion: Grades are acceptable, ECs not strong enough for a hook, so your essays/recs/profile will play a big role. So will luck.