Out, out damn smell!

I am 23 years old and I am extremely self conscious about vaginal odor. I don't like my boyfriend to perform oral sex because I am so worried that I smell bad. I scrub and scrub my genitals in the shower but an hour later the smell is back. When I asked my OB/GYN about it he said that he would check me for STD's but never explained anything to me....

But they wouldn't sell douches if they were bad, right?

My boyfriend is convinced that I should douche. I have told him about what I've read on this site about how bad they can be for you but he argues that they wouldn't exist if they were that bad. I have recently had 2 UTIs and 2 yeast infections within a couple of months so now I am wondering if maybe he is right and that I should douche......