@AriaAfrouzeh, I have been following this thread with great interest. You’re getting some very good advice.
One thing I’ll add from the parents’ perspective: I used to think the only great schools were the Ivy League schools and a few others (sometimes referred to as the T-20 or T-30, etc, with the “T” standing for “Top”.) Now, I realize how naive that was/is. There are a huge number of great schools in the US and all over the world.
What I do like about the US higher ed system is that it allows for flexibility. Say you want to study biology and then you realize you hate it (that was me!). Within reason, you can change without starting over again.
The folks here truly want to help, but you have to help yourself. As others have asked, why the US? Since you have family members who came from Iran to here, have you spoken to them and got their advice? And keep in mind that if they did this more than just a few years ago, college admissions here in the US has changed a lot (it is unrecognizable to someone like me who went to college and law school decades ago).
Hopefully, you have a sense that this will not be easy, but I am a big believer in trying to achieve your dreams. But you have to do the research to make sure these dreams are attainable.
You were deferred from Harvard REA? I am no expert, but that sounds promising (still not sure why you withdrew). You strike me as a very intelligent person. Use that intelligence to understand the complexities, but do not ignore what you have at your disposal: university in Iran. There are so many online fora for getting additional knowledge beyond any limitations you perceive with that route.
I would encourage you to find your passion and go for it wherever you might be. The US is far from being perfect, and if your dream is coming here and that alone or going to a T-20 school, that’s far too limiting. If you have access to a computer and the internet, the world is already available to you.
I wish you the very best.