Secondly. <deep breath>
I am 38 years old, and I have had many partners. It helps that I was something of a slut in college. In fact, I have the (minor distinction of being more experienced giving oral than anything else. Every experience I have had that involves genitalia, I have performed cunnilingus. I have not always received fellatio or coitus. Heck, sometimes Mr. Happy never got to see daylight, so to speak.
My point is, I've been with unshaven hippie chicks, and with rah-rah former cheerleaders. I've been with brainy anarchists and kind of ditzy conformists. I have had a not immense but I like to think representative sample of women parts, and I've tasted all of them. Sometimes that's all I've done.
With this information, I can tell you: it's all good.
Every woman has a different scent, a different appearance, but the variations are very minor; if you don't try and pay special attention, you can easily miss the differences entirely. It's all natural. I've never, ever encountered anything off-putting, to the eyes or nose.
Plus, in a way, it's kind of like pizza: even when it's bad, it's still pretty good.
It's natural to be self-conscious. Particularly if you've never done something before. You have no way of knowing if you're a mutant or what. But trust me; you're fine. I can tell you that without a photo or chemical sample. There's normal variation, and you're within it. No matter who you are.
Sorry for the long post, but I thought it was valid to say.