I know a bunch of people have already commented, but anyway. Considering you got 4 interviews, I would definitely do some self-reflection on why they clearly didn't go as well as you thought. It seems you think your answers are solid and positive, but it may be that they're too rehearsed, and that your interviewers couldn't get a sense of "you". I'm going based off what I've heard, but the general rule of thumb is 3+ interviews should garner 1+ acceptances - if not, it's the you in person, not the you on paper, that's holding you back. I watched a few youtube videos (mostly to see the time-length of answers, body language, etc and adjust my own accordingly) and answered
a lot of questions to prepare for my interviews - I used
http://dept.lamar.edu/biology/preprofessional/medical school interview 71404.htm as a one resource of many - I think the MSAR 2012 also has a list of commonly asked questions, if I recall correctly - not sure if the 2013 version does as well. Only make notes when preparing the questions - jot down the basic idea so when you're in the interview it sounds more conversational, and try to give 1-3 personal examples in order to back up your answer, which helps address that "you"ness that may be missing on the interviewers' end. Also, you mentioned being respectful and cordial in your interviews - that's definitely important, but maybe don't be afraid to let your 'natural' personality show as well. Not saying the two aren't natural to you (or really to anyone interviewing, one would hope aspiring physicians are), but I was a tiny bit sarcastic and goofy at times during my interview once things got underway and the timing seemed right, and 5/6 of my interviewers laughed and were even friendlier afterwards (the 1/6 was just a bust going into it, so I didn't even bother) - I still was respectful, of course, but I'm not a perfectly calm and collected person and didn't feel the need to portray myself as such. Being more 'myself' definitely helped me make a stronger connection with my interviewers and made the general atmosphere of the interview less formal and stressful.
That being said, your MCAT score isn't doing you any favors either when combined with an okay GPA (going based off what my pre-med advisor said when she saw my 3.6cGPA, which was "eh, it's okay, but at least you did well on the MCAT"). A 26 total may be fine for DO school, but a 7 is quite low, especially for a science section. I know you're applying DO, but most MD schools view 8 as the cutoff score, so that's generally the standard you want to reach regardless of which you apply to since many DOs seem to be trying to increase how competitive they are. As others said above me, studying for the MCAT has the nice bonus of showing interviewers next cycle how you spent a portion of your time off. Personally, I found the Kaplan Online Science Review to be a godsend - I spent a solid 10-12hr/day for 1.5 months using that review when I retook the MCAT. I'm pretty terrible at physics and general/organic chemistry, but the review laid out all the concepts in a format that was easier to understand and had tons of questions available, including full test sections.
Finally, it wouldn't hurt to increase your clinical experience. It doesn't necessarily have to be shadowing, just anything that puts you in direct contact with
patients (as opposed to people in general
, which it seems a significant portion of your ECs involve - I'm thinking that may be playing a factor in final decisions if your interview answers aren't coming off as strongly as you'd like).
Sorry for rambling... it's never a fun feeling wondering what went wrong, so hopefully you have gotten/will get some advice from somewhere on this thread that works for you. Also, maybe there're still more IIs coming your way later this application cycle? There's still time! If so you can still prepare more effectively for those by figuring out what may have gone wrong on the others.
Good luck!!!