My vagina fills up with air all the time.

Why does this happen to me and does anyone else get this? Every time me and my boyfriend have sex my vagina fills up with air during the foreplay weather he’s eating me out or fingering me. The air does come out but during sex it’ll fill up again he says it doesn’t bother him and that it’s annoying because sometimes when he goes to put it in he has to get the air out and when he doesn’t get the air out it hurts both of us. I hate it because it makes me queef during sex. Please help me