How can I prevent/cure smelly underarms?

I know this question seems a little silly, but it's worth asking. I'm a 20 year old female, slightly overweight (about 20 pounds), and I have a problem. My underarms ALWAYS SMELL. This started happening when I started college. I visited my gyno for my yearly exam and I decided to ask him about this problem but he recommended I seek out advice from a dermatologist (he also said that if he had to guess, that stress is what's causing this problem). I don't really have the money to go to a dermatologist, so I'm using Yahoo as my last chance. Like I said, this problem started about two years ago when I started school. I've used every method that google has provided me, baking soda, lemon, vinegar, exfoliating, blah blah blah. I'm a nursing student, so I am aware what causes armpit odor, I'm just not aware what I can do to make it go away! I've used nearly every type of deodorant, even the "clinical strength" brands. I don't sweat a lot, I just have smell. Deodorant honestly seems to make the smell worst. I've gotten to the point to where I have to carry around alcohol wipes and deodorant when I go out so that when they start to smell, I can make my way to the restroom to "refesh" myself. After I shower, I put on a few swipes of clinical strength deodorant and within the next few hours or by morning, my armpits will smell like I've been working out for three hours (no sweat, by the way). I'm wondering if this is some type of hormonal problem. Has anyone ever experienced this problem or have you ever known someone who has? Any cures/prevention methods? Or should I just suck it up and see a dermatologist?