Is waiting till marriage the only way to not be a man's ''forever, childless girlfriend''?

I know I'm just 19 at this moment but seems like that's the only way to avoid men taking all their sweet time, thinking only about themselves and not caring about our limited years to form a family, to have healthy children. I don't want to end up being a 30+ year-old, childless woman. I don't want to find myself in the ''We're been together for 5 years, why won't he propose'' situation either. They have all the time they want to. WE DON'T.

Is going old-fashion and waiting till marriage the only way to not land in one of those ''You're the love of my life'' 4+ year-old relationship (the guy wins there.. while we lose if we can't get him to commit and give us kids) heading nowhere?
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+1 y
Analyzing this from a biological view, there is no benefit for us if we date around for years and have sex with random men. NONE.
From biological evolution... that's not really the purpose of a woman. She has to find a provider that will be there for her and the child... that will commit and not leave.
Is waiting till marriage the only way to not be a man's ''forever, childless girlfriend''?
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