Question about oral sex

We’ve not really done oral sex on me much. I love giving it to him but neither of us have ever been overly bothered about oral on me. Recently he has wanted to try but I can’t say I really enjoy it. Partly due to embarrassment and partly because I have a really sensitive clit and if he touches it directly with his tongue it really hurts. I can’t relax because I’m constantly worrying! Any ideas?