Scared to let my man go down on me😳

I'm really afraid of letting my man give me oral 😳! I don't know why I'm always panicking like what if he thinks it doesn't taste right or whatever I'm constantly panicking about stupid things😂 he's the only guy I've ever been sexually active with and as you may have guessed I've never had oral off a guy before , and it's scaring me ! He keeps asking if he can or why I won't let him and I'm just so paranoid of what he may think 😫