<p>@ OP: Everyone has given you extremely sound advice thus far; any topic in physics, astronomy included, requires a good deal of understanding of mathematics. Rather than repeat what has already been said, I just wanted to offer a bit of encouragement. </p>
<p>I was in a very similar situation two years ago (entering my senior year of high school). I had just finished taking a college course in astronomy over the summer; I got to image distant objects, run analysis on these images, and write multiple papers on our findings. The whole experience was incredible, but I hadn’t yet taken a true physics course (not even at the high school level) and I wasn’t sure how much I would like the advanced math associated with physics (hadn’t yet taken calculus). Fast forward two years: I’m in my upper division physics courses, I find calculus to be very natural and easy, and I don’t regret my choice for a second. </p>
<p>Don’t be intimidated by the math; I tutor high school math of all levels, and calculus is by far the easiest in my eyes (I actually had a student who was struggling with geometry and was ready to give up on math altogether, so I pretended to teach him things he would see in Algebra II the next year and instead taught him calculus, and he didn’t believe me when I told him because it was so easy for him). I imagine you’ll do well with calculus, as well. </p>
<p>Something else worth noting, just in case no one else has, is how CS intensive most physics can be. I’m hoping it was you that I saw mention AP CS, because if so I think you’ll enjoy some of the analysis work. I know that astro involves a good deal of coding, as well as high energy (particle) physics, and the two are beginning to cross-over more and more as particle physicists are searching for dark matter.</p>