Become a Doctor

I’m so terrified that I won’t be smart enough. I keep thinking that my mind will have bounds, that one day I’ll hit the wall and not be able to learn anymore.
I’ve been in the top 3 highest averages in my grade since I was in grade 7. Last year my average was 98%. I’m extremely well rounded, so I could go any sort of direction in university. Which actually makes it harder to choose. People just think I’m being stupid when I say this. I just keep freaking out. I don’t know if I’ll be able to handle university chemistry and biology. I know that I’m smart and everyone seems to think I can for sure become a doctor, but I’m scared. I don’t think there’s a lot besides medicine that I would want to do in the science field. I find diseases and the human body fascinating. I just want to do it. I’m not confident.
And I hate physics.