I don’t think CC is a kiss of death for MD/PhD, but you will have to transfer and graduate from a 4 year institution, and my guess is you will need at least 1-2 gap years in order to be competitive enough. If you get enough research experience and good grades and a good MCAT, I think the CC start won’t matter.
My understanding of what resources CCs typically have means you will not be able to get involved with research through the CC - and I wouldn’t bank on being able to get any sort of position outside of the CC either. Any university is going to preferentially take its own students. You would probably have to target PIs who take high school students into their labs since you will probably be considered to be at that level until you transfer to a 4 year school. Since you’ll have to take significant upper level sciences unlike a straight pre-med, you could probably get away with taking intro bio at CC. Normally it’s best to focus on GEs in CC and save as many of the prereqs as possible (which are more important for admissions) for the 4 year school.
Now, as mom2 correctly points out, the fact that you are doing so poorly on the SAT and may not be able to get into a 4 year college is the worrying part. MD/PhD admissions is more competitive than MD - which is already incredibly competitive, and it’s only getting more competitive. According to my MSTP director, it’s gotten to the point where anything below a perfect score from interviewers probably means waitlist at best. The test scores and GPAs are certainly higher than MD only, the expectations for the transcript are higher than MD only, and the EC expectations are also generally higher too (different programs have different opinions on how much of the typical MD stuff they want to see in MD/PhD applicants in addition to the extensive research experience they want to see). That doesn’t mean you can’t turn things around, but you need to be realistic about where you currently stand, and where you need to eventually be. When you get to CC and eventually your 4 year school, you’re going to have to make use of any and all available resources to catch up with the kids you’ll be competing against for MD/PhD spots.
Having just gone through the process of writing my 180 page dissertation - yes, writing is critical in science. It’s one of the biggest misconceptions among kids (not saying you have this misconception) that science and humanities exist in this dichotomy where one involves lots of reading and writing and the other doesn’t. I’m not super familiar with the new SAT, and when I took it, there was no writing section. I remember the SAT2 writing was mostly a grammar test and that the essay was its own distinct style of writing that isn’t really reflective of real world writing. I say that because I don’t think being able to write a perfect scoring essay on the SAT means one is actually a superior writer to someone with a good score, but the differences between a good score and a bad score are based on important elements in writing.