I haven't got any siblings, but I can much relate. Only that I'd got picked on for being a "good" child, who had good grades and what not by peers mainly. I somehow became this obedient child because of my upbringing, and maybe temperament, I don't know, this was my coping mechanism when no mistakes were allowed.
But it wasn't really working anyway later because even though I had good grades, there was always something not good enough about me, usually my physical appearance, from my parents' perspective.
From the other kids' perspective I was not interesting enough (or was just different idk) because of being the "good" child, and I have a lot of memories with former friends abandoning me for others who would be for example interested in boys when I wasn't yet.