69 and sitting on face

Am I the only girl who doesn't like 69 or sitting on my boyfriends face!? Like I love when he eats me out and stuff but when ever we 69 I just keep thinking about how his nose is at my butt hole and if he can smell anything and how my whole body is laying on him. And when I'm sitting on his face I just wonder if his comfortable and can breathe okay...idk it feels okay, I just really worry and over think about it. And I feel like I'm supposed to like it but I just think to much. What is your opinion on 69/sitting?