Why do men only see me as a fling not as 'wife material'?

When I date men, they always end up telling me that they 'don't want a serious relationship' afterwards and they always tell me that 'they're up for fun though' and end up acting very sleazy. They say that i'm attractive and y and whatever but never seem to want to commit and they almost always end up flirting with me in a ual way and asking me if i'm down for a fling, sort of like a 'friend with benefits'. I really don't understand why this is because I never kiss on the first date or do anything else, and as soon as they start acting sleazy I back off. I do sometimes subtly flirt but just as a normal girl would on a first date I don't go overboard and act like a slut. I have a very strong dominating personality and i talk a lot so maybe they get intimidated? I don't dress slutty but i do wear quite a bit of make-up. What's up with me? Oh and it can't be just a coincidence that all of this men just want to sleep with me instead of having a proper relationship. I'm 19 btw. I'm not a slut in any way I haven't kissed anyone since my ex which was 7 months ago!