The truth is that a lot, dare I say the majority, of guys in their late teens and early-mid twenties, want one night stands, friends with benefits, and non-exclusive relationships over official committed relationships. You just have to find guys who genuinely want the same type of relationship as you do. You can do this by changing the way in which you find the guys you get involved with. For example, guys at clubs and bars are likely to only want a hookup, so avoid them. If you use dating apps, try Hinge and Bumble over Tinder, which has basically just become a hookup app now. And if you meet guys through your friendship circles, try and find out about their relationship history before you get involved with them.
Also, as horrible as this sounds, the way you carry yourself might have something to do with why men treat you the way we do. Men often think that if a girl wears provocative clothing, a lot of makeup, or is extremely attractive (I'm talking actress/model level attractive), then she's more likely to be easy. It's incredibly unfair and sexist I know: as women we know that how we look and dress normally doesn't have anything to do with our intentions when it comes to sex and relationships. But unfortunately a lot of men don't see it that way.