I feel you completely! My sister is perfect in my dad's eyes and my brother is the second coming of Jesus in my mom's eyes. This is something I'm trying to work through in and out of therapy. It really hurts to want their approval but at some point I have to accept that they'll never see me the way I want them to. Sure it hurts to think that, but I won't be happy until I just accept it and move on to making myself happy instead of trying to please them, which wouldn't matter anyway because I'm not my siblings.

So, I feel you and I wish I could give you better advice.