One grade will not define you. At most colleges you will never know why you were admitted or denied to a college - and it will not be due to one grade. Colleges with cut scores or other thresholds obviously could be impacted, but based on your other posts you have a healthy mix of colleges with holistic admissions.
Your AP score will give you an idea of where you stand on proficiency along with a conversation with your teacher. As you move forward in more advanced math next year make sure to fill in any gaps.
Spend time this summer digging in on CS and Engineering options at different colleges as the CS in engineering schools compared to being housed in other departments changes your options and experiences. Look at the course catalogs and see what may be of interest to you. Figure out if you want a small CS or engineering program with a maker space and collaborative projects or straight programming and expansive offerings or some combination. Your essays will come across as more authentic if you understand why you want to be at one school over another.