I have difficulty understanding how you find time and energy to complete all of your ECs and still maintain very high grades.
If you are considering medical school as a possible future option, then you need to budget for a full 8 years of university, where the last 4 will most likely be very expensive. Even if you are not considering medical school, biochemistry or biology are majors where some form of graduate school is likely. To me this makes your in-state public schools very attractive, particularly since you have multiple very good in-state public schools. I would hope that your chances would be quite good at UT Austin, although your guidance counselor would know better than I. TA&M is also very good.
When I see a student with exceptional academics, plus “tennis state champion”, I wonder whether it would be worth also sending in an application to Stanford. It would be a reach, and I would only consider it if you and your parents are okay with whatever the NPC predicts plus the cost of whatever graduate program (medical school, master’s, or otherwise) you are likely to want to consider.
It sounds like you are doing very well.