The OP was painful to read because I see my D doing something similar. She’s in 10th grade and completely focused on getting into an elite university. School is fairly easy for her and she scores highly on PSAT/ACT … but not high enough for the Ivys, etc. Has almost no social life. We keep telling her to have fun NOW and worry about college later. AFAIK, many of her fellow students at the highly competitive public high school are similar. This pressure that high school kids are feeling these days is not a good thing in the long run … they are going to be burnt out by the time they get into their professional lives, where things really matter.
I probably won’t get any likes for what I’ll say next but … take what you’re passionate about right now and explore it with the same effort you applied in high school. It doesn’t need to have a purpose other than to satisfy your curiosity about the subject. In high school I was obsessed with music like most teenagers, so I bought a guitar at a pawn shop and learned how to play it. I also made my own guitar effects so I could sound like the rock bands of the time. I was a terrible HS student (200th out of 400, yikes – watch the movie “Slackers” to see what it was like growing up in the late 1970s in Central TX) but I managed to get into UT-Austin in EE based on my SAT score. That led to an obsession with computer programming. Had summer jobs writing code and worked at Motorola’s fab near Bergstrom on weekends while in school. I ended up dropping out of UT around my senior year but the programming experience I had accumulated got me a job at a small company and that led to a large software company. I now have my own small software company.
Go to UT or Rice. Thoroughly explore what you’re interested in right now and what you’re exposed to in college. You already proven you kick a** in what you want. I imagine the opportunities at UT are an order-of-magnitude greater than when I was there. The university you go to isn’t as important as what you do with what you’ve learned.