There are a few things here I can think of.
First of all, have you been to a health care professional and had a thorough exam and screening, just to rule out that you don't, in fact, have any conditions that could be making your vaginal odor stronger? There are conditions which can arise without sexual contact being necessary, like bacterial vaginosis, which can affect the scent of your vaginal secretions.
Second, stop with the perfume spraying, and don't even think about the douching. Anything that you put down there that can upset your body chemistry--like douching, perfumes, or those "feminine hygiene sprays"--can bring on an imbalance like the ones I talked about above, and can even make you more prone to yeast infections and more susceptible to STD/STI transmission. So this is not the solution.
See what a professional has to say, and make sure that there is not an underlying medical condition that needs to be taken care of. If not, perhaps this is something normal about your body chemistry. It's likely, too, that you notice it because you're so worried about it, and that no one else may ever notice. Finding out for sure that it is not a symptom of a bigger underlying condition may ease your mind, as well--and if it *is*, it can be treated.
"And when the answer that you want/Is in the question that you state/Come what may..." - Coheed and Cambria, "Blood Red Summer"