My older sister and I have always been different - she the partier, me the student. We come from an upper-middle class family, so we never really went wanting. For the most part, she and I received equal treatment from my parents financially. I moved interstate for study when I was 20, and she left home when she was 22. I moved into student accommodation, and have been renting ever since (now 26). My parents paid for none of my rent.
However when my sister moved out, she moved into a house my parents bought, and she paid half the mortgage with housemates (which ended up being less than my rent interstate), with my parents paying the other half. Now she's looking to sell the house, at an expected profit of A$100k ($50k each), which she's able to put towards her new house and avoid the mortgage insurance added to any house debt with a deposit under 20% (so saving another $20K I never would be able to). Then there's me, struggling to save money so myself and my partner can move back home (need $20K for that alone) and actually buy a house. I'm so bitter about it. It's been made pretty clear my parents don't have any intention of helping me out in the same way.
I don't want to be bitter - I really don't. If I breach the topic with my Mum I know he answer will be all defensive ("You've had enough") or something of the like and I'll be blamed for the negativity. It's almost like I've been punished for getting a good education - I left so it's all my fault.
Am I overreacting?