So I've asked over 4 doctors to shadow...politely gave them a sort of resume of where I am in school and my achievements etc. All of them seemed almost insulted and said "you should not shadow until you are a medical student" WTF!!! I was so irate...if I end up like that when I'm a doctor I'll hate myself. I ended up shadowing this surgeon a little only because he is a family friend...pretty cheap way of finding someone to shadow but whatever. I asked my friends how they find doctors to shadow and EVERYONE said either that parents are doctors or they had close family friends who were docs...meanwhile I get the shaft whenever I try to cold-call. Seriously I'm to the point where I'm embarrassed to ask a doc to shadow because all have laughed at me so far...
I'm really sorry that you've had such bad luck. I also promise you that there are tons of nice, or at least friendly, doctors out there who will let you shadow.
If you haven't yet, I recommend that you go onto the website of the nearest medical school (I hope one is near you) and find departments you're interested in. Send a polite email or telephone call to a handful of doctors, one at a time, stating the basics (undergraduate, interested in their specialty, want exposure, your availability, thank you). I know this is kind of basic stuff, but I hope it's of some help somehow.
Personally, I've found it hard in the past to meet and maintain relationships with doctors while volunteering. Your experience could certainly be different, though.
I would expect that doctors at an academic hospital will be more likely to let you shadow, especially if you and them are affiliated with the same institution. However, some hospitals do have very strict policies about shadowing now. This
may have been a factor in the responses you got from doctors, though I quite disagree with them.
Edit: If all else fails, volunteering probably
would help. Just make sure you spend your downtime productively (hang out with nurses and doctors who are on break, rather than putting your face in a book like I tended to do).