Your number one focus right now should be getting into college. Your high school gpa/ranking is irrelevant for med school, it only affects where you go to college. Because of your rocky finish in high school, it will take a little extra effort to get into college.Honestly, I think if you contact a 4 year university, they will tell you to go to a community college for a year or two and then try to transfer. I would schedule an appt w/ your local community college advisor ASAP because you still have plenty of time to study for your ACT/SAT and then start courses in the fall (or maybe even this summer!).
While it is true that some medical schools prefer coursework from 4 year institutions over comm. college coursework, I believe it would be better to get all A's for two years at a CC and then transfer rather than to get B's and C's during your first few years at a 4 year while you were "adjusting" to college life.
You must also remember that although the required pre-reqs for med school is a short list (a year of general chem, organic chem, bio and physics and sometimes english and math) it is HIGHLY SUGGESTED (and therefore practically an unwritten requirement) to take additional courses such as Biochemistry as well as many other upper division biology courses such as Cell Biology, Genetics, Anatomy, Histology and Physiology. Getting A's in these types of courses at a 4 year university your Junior and Senior year would definately help to balence out any stigma attached with doing pre-reqs at a CC.
An additional reason I think a CC would be a good start is because they are designed to help students that have had academic trouble in the past (for whatever reason). They are a great place to learn how to study and since you have been out of school for a couple years, it would be a great place to ease back into school. The expectations of a 4 year university was kind of a shell-shock even for someone who has a near-perfect GPA from high school and there is no shame in starting out somewhere that is better suited to help you.
I have heard so many times that one of the most important characteristics in a medical school applicant is perserverance. You have a long road ahead of you, but if medicine is truely what you want to do, you'll get there.
I think becoming a CNA would be of great help to you, or preferable a Patient Care Tech (AUA) because a Pt care tech gets to do more. But right now you should focus on getting into college and then once you have that squared away, focus on becoming a CNA or AUA and getting lots of clinical experience.
Ok, right this minute you should go call your local community college! Schedule an appointment for next week! When I check back on this post in a couple days, you should say you've got an advising appt. next week! Good luck!