@ikim16 A hundred years ago when I started college and majored in CS, I didn’t have much experience with programming either. I think I had done a little fortran and cobol, but really nothing too formal. I might have learned Pascal but honestly can’t remember if that was in high school or that first CS 101 class.
I had no troubles at all with my first real CS programming classes. They’re designed for beginners, and designed to introduce you to programming methodology moreso than programming languages. At least, I would hope so at most decent schools (my school was pretty rigorous). It wasn’t until junior/senior year that we were expected to be able to learn a new language on our own. I still remember the first day of my class in operating systems - the teacher said, “The first assignment is due in two weeks. It’s in C. If you don’t know it, now would be a good time to learn it.” But that didn’t come until after two years of learning a variety of other languages.
So I would say don’t sweat it too much. Buy a random book on introduction to programming and have at it. Or go create your own website and do some java scripting or whatever for it. Anything to dip your toes in the water and see how you like it. Other than that, I’d say relax and enjoy your upcoming summer.