Insecurities

So basically my bf is coming to see me in March because we’re in a long distance relationship for now. And knowing that we’re gonna get down and dirty he’s mentioned that he wants to go down on me and don’t get me wrong that’s great and all but I’m also really worried and paranoid. I’ve always been shy when it comes to that because I feel like I don’t know how I should be smelling like or concerned about how I’ll taste. I’m not saying I have bad hygiene but it’s always in the back of my mind. Or what if it looks gross because I myself don’t really like the way my vagina looks but i guess that’s why I couldn’t like women lol. I want to get over it but I don’t necessary know how. And I’ve told him this and he’s really kind about, he says I’ll be fine and to not think about it but I can’t help it. I feel like as soon as he tries I’ll panic or something. So I’m just wondering what other people may say about how to get over this.😖