am I doing 69 wrong?

I'm just confused about 69. I understand why but I don't like that if Im on top(girl) and his nose goes right into your ass! I'm not one for that kind of thing, does it bother the guy? 
Also if he's on top, he is constantly deep treating me and I can't seem to relax while 69'ing so I just don't if I'm doing it wrong or just over thinking