Sex with my boyfriend

I’ve had sex many times so I’m not like a virgin or anything. However, the sex that

I had before is not like the sex I will have with my boyfriend. He wants to eat me out and and I’m just scared and honestly really insecure about my body. He knows and tells me there’s nothing i should be insecure about and that I’m beautiful. But I’m not used to guys going down on me. Is there anything i can do so I’m more comfortable about it or anything. Any tips at all really I’m always afraid that I’m not going to taste good or something and he’s a lot more experienced than me.