Afraid of oral 😶

So I’m a girl and my boyfriend really wants to go down on my but every time we’ve gotten close to it I stopped it... it’s not that I don’t want him to because I rlly do ! It’s just I dont know what to expect ! He’s never looked at my vagina or anyone’s in real life so what if he’s grossed out .. what if it dosent taste nice ... what if he thinks I’m discusting ... what do I do .

I just have so many questions