Going "down"

Hey girls... So I've been sexually active for around three years now... All with the same guy. He's my BEST friend...And... *get this* I am still SOOO nervous and uncomfortable when he tries to eat me out. No, it doesn't hurt. I am just sooo afraid of so many things... 1: I'll "taste" or "smell" gross (I mean come on, it's a f**king vagina...) 2: I'm afraid I won't orgasm and that that will hurt his feelings... (He's went down for like fifteen minutes before and NOTHING happened.) 3: Having him go down on me requires me to communicate with him "what feels good" and "what doesn't".... THAT IS SO AWKWARD AND UNCOMFORTABLE!!