I concur with previous posters that it is going to be an uphill battle for you to attain the MD/PHD level. However, it is not entirely impossible for a CC student to catch up and be successful. I think what you should do first of all is trying to take learning seriously and get the highest grade possible while you are in CC, perhaps all As. From there, you should try to get all As in the 4 years school afterwards.
Its going to be hard to get any research opportunity while you are in CC, but when you get into a 4 year college, hopefully with an University with med school and hospitals, you should try to get all research opportunities, during and after the semester. In addition, you may need gap years to keep up the research efforts to be selected as MD/PHD candidate.
In a different profession, I know some one personally who came from a humble CC background and became a top scientist in NASA and was a director in major space missions.
Good luck.