oh i see what you're saying @Former-Member what's the longest length of time you've dated someone? i ask because i wonder maybe its to do with not knowing a person long enough to have that convo? i do acknowledge that its different for everyone, i know some people who bring up 'do you want kids in the future' convo on the first date and then others who don't talk about it until they're months into the relationship.
but please know that a lot of the time, someone's interest in having kids could be more to do with them than the person their dating. things like fertility, job commitments, etc., could all impact someone's decision, and them not bringing up the conversation does NOT automatically mean its because of you. i'm really sorry that you've felt this way for a while.
and i think there's nothing wrong with wanting a biological child, everyone has their own preference. last resort - maybe a surrogacy sorta thing with an egg donor so that you can have a biological kid? i'm not too familiar about surrogacy stuff though but i wonder if that's possible though.