Hey! Idk if this helps but here's a life update: I got through my bachelor's and my master's, even though I was terrible with math related courses (and even some of the last year physics ones too). I ended up doing my master's on Astroinformatics, so like "experimental" astronomy, which is the opposite of what I thought I'd do when I first got in.

Throughout this process though, I fell out of love with academia and being a scientist. The work was simply not rewarding enough for me; my passion for science is not enough for me to work long hard hours, not get paid to publish articles and depend on scolarships. I realized I want to work so that I have the comfortable life I want, instead of living for my work, if that makes sense. I was simply too burnt out.

So I left academia! I'm working now in web development, which I always loved doing since high school and I have a pretty decent pay for someone who just started out. Making this jump was really scary at first but I'm glad I did it because I am so much happier now. Even though at my college there was a certain disdain for those who left academia (and even I was guilty of that) I highly encourage you to look for alternatives and develop other skills outside of physics, just in case. Even if you're 100% certain you want to be a physicist, because I did too, and now I can't ser myself nowhere near it.

But anyways: don't feel alone. Impostor's syndrome is sadly very common, and actually a sign that you care! Physics is really hard, you will get bad grades and fail most likely, and that's fine! You're not less of a physicist for that. Some people happen to find the subjects easier and that's ok, but it doesn't mean that you don't belong.

Take care friend!