The same reason eldest daughters are treated that way probably

This sounds like it culturally happens to varying degrees, depending on one’s upbringing. So while I don’t know the specifics of your situation, reading this makes me think: Are we not allowed to learn to create and hold our own boundaries as adults? I know that doesn’t actually answer your question but I often want to jump straight to pointing out this type of coercion from parents, regardless if they mean well or what traditions were placed on you long before you were born, doesn’t mean you have to follow along*. (*Not speaking for extreme cases, such as having to look after a dependant family member, etc. but it should be a very short list of exceptions once we become independent adults)

Prob cause we persevere

We set the standard and are expected to uphold and maintain so much. Because we make the most of whatever circumstances we find ourselves in. Resilient and rising to the occasion to hold it together in a world that’s trying to tear us apart

We are much more reliable for a multitude of reasons. Our relisiance and resourcefulness was forced upon many of us as societal outsiders. Once our parents understood what many of us had to endure, they realized we developed a strength that their other children didn't.