Well I can't blame you for being self conscious. I think we all go through that phase.
Anyway, if you're receiving oral and the one pleasing you is really into it and not stopping etc, then obviously they don't have a problem with the smell or taste. From what I heard, women will have varying tastes and degrees of "odor"(as long as it's not fishy etc which would indicate a problem such as infection).
In order to enjoy the act more you might want to consider showering or cleaning up that area a little more before receiving(if you know you are going to be intimate in that way). It should ease your mind some!
Otherwise don't sweat it unless there is an actual problem. You'd know if a guy had a problem with it lol.
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