Are you rejecting the D.O. route because of the less rigid admissions requirements associated with those schools? Or do you desire the socially prestigious M.D. title? Have you done any further research? Students taking an osteopathic curriculum aren't automatically less intelligent, less successful, etc.
If you were so persistent on getting into medical school, why did your GPA suffer during freshman year? I'm genuinely curious; many students have trouble adjusting during their first year at college, but I see no trend of attempted improvement. Assuming that you listed your courses in the order you took them, that first semester would probably leave you with a GPA below 3.0. Why didn't you use this as motivation to make at least an A- in every course the next semester? Courses such as Writing and Religion should be GPA boosters if you put in the work.
No promises that everything will go well, but if you're definitely set on an M.D., it's going to take a lot of commitment and stellar grades from here on out. Figure out your strongest study habits, manage your time well, and push yourself like hell.
Realize that despite the importance of EC's, leadership, etc., a strong GPA/MCAT will get your foot in the door at most medical schools. If you still refuse to consider D.O. schools come application time, I would suggest majoring in something that will ensure a strong alternate career. Good luck.
