Tips on getting comfortable with receiving oral

I’ve never been comfortable with my own vagina sadly. I was raised for that to be a very taboo and awkward conversation. Which carried into adulthood and makes me uncomfortable and cringy still.

I’ve been eaten out multiple times throughout the years and never really was comfortable enough to enjoy it. My partner now and for forever REALLY enjoys doing it and wants to do it. I reassure him it’s not necessary because he literally gets me every time we have sex and I orgasm every single time. It’s truly amazing. He says we’re going to be together forever and wants to be able to please me in every way though. I get his point and I’ve always wanted to be comfortable with it. I mean thinking about it turns me on but when it comes to having it actually done, I go into a shell.

I’m not sure where my discomfort lies with being eaten out? I know if I could just freaking relax I would enjoy it and enjoy him more. Why can I relax during sex but not receiving oral???

He reassures me it tastes like water and no smell and literally I cringe when he says that to me because I become anxious like is he just telling me this because he has to?! - I know he is an honest man, I just don’t know how to turn my brain OFF and relax.