Why do i get grossed out when doing stuff with guys?

i know that kind of makes it sound like i'm a lesbian but i'm not haha. it just seems like guys always have bad breath and are always breathing in my face and stuff. and they always want to shove their tougue in my mouth which does not turn me on at all. it's not like these are gross guys either. my boyfriend is very attractive and so was my ex. does anybody else have this problem?