i am currently a junior in hs looking to possibly complete calculus I over the summer for college credits. i would proceed to take ap calculus bc at my high school senior year. im worried that ill do badly or that six weeks wont be long enough to fully learn the information. im taking honors precalculus now and have a natural affinity for math and am also looking to major in it in college!! also are there any programs that would offer this?
I took a course called “Elementary Calculus” at my high school during its summer school program. Does your school district offer a similar option? If not, perhaps look into your surrounding community colleges or even edX. I’d highly recommend taking the course, as the first half of Calc BC covers simply Calc AB topics, so you’ll be helping your future self out. 
Best of skill!