Pharmacy School is extremely heavy in Chemistry (General Chemistry I&II, Organic, Inorganic, etc.), Biochemistry, etc. Getting Cs in High School Chemistry might suggest that Pharmacy might not be a good fit for you. What is your GPA and SAT/ACT scores? I would suggest you take an Introductory chemistry class at your local Community College while still in high school (dual enrollment) to see what your performance on this college course would be.
Below is a link to the Doctor of Pharmacy Curriculum at the University of Florida. Most Pharmacy programs follow similar blueprint. Pharmacy programs are very intense and Chemistry/Biology centered. If you are weak at this stage, you can turn things around by study chemistry on your own to make up for any deficiencies.
http://pharmacy.ufl.edu/education/student-affairs/doctor-of-pharmacy-curriculum/