Am I doing something wrong?

Hey, I have a friend (rising college freshmen) who just went through the application process. I often ask her similar questions, and she always tells me that colleges like to see consistency more, so rather than going for something new this late in the game it would be better for you to strengthen something you already have going for you. With that said if you are simply interested in getting involved with something happening in your field, I would recommend looking into internships are volunteer opportunities. That very friend I spoke about would go volunteer at hospitals during the summers and assist. Maybe something like that would be of interest to you. Me on the other hand I am in the process of interning for some research studies in my field if that seems more up your lane.

In regard to the SAT/ACT my personal view would be that it could never hurt to try especially if all it can do is help you, but I don't know much about all that stuff.

Consider taking the ACT. While the SAT is great, if you're focusing on medicine I'd bet you're pretty good at science, so your score will likely be higher than it will be on the SAT. You don't have to report scores to a lot of colleges, so if the score is bad, it won't hurt you unless your school is not test optional. They also have a lot of great resources online to help you study.

For the SAT/ACT, I personally took an SAT practice test and realized I didn't need to sacrifice much time studying and I could get a pretty solid score. A practice test takes like 2 hours and it's very accurate, so if you're not sure if it'll be worth it, it's really helpful.