What are my chances

There's no reason for you to let go of your dream. Your extracurricular activities look great. And a GPA is fixable. Assuming five semesters went into that GPA of 3.1, with 4 more semesters and one summer of school, getting a GPA of 4.0, your GPA could get up to 3.55 by the time you graduate. With a better than average MCAT score, you'd have a shot at MD med schools. If you can get it up to the 3.3-3.4 range (which would take less time, assuming the same great grades) and get an MCAT of 24-27, you'd be a good candidate for most DO med schools. If being too involved in activities is hurting your GPA rescue efforts, maybe it's time to cut some of them out and concentrate on your grades. No one will appreciate your excellent activities if your stats don't beat the schools' automatic cut offs.

There are, BTW, some DO schools that will consider your application with your current GPA, assuming a decent MCAT. here is the link to them: http://forums.studentdoctor.net/showpost.php?p=7199902&postcount=2