My condolences for having such a rotten sister!

It seems to me that your parents gave your sister an unfair advantage while cutting you short and now she has disproportionate expectations about how the world works. My older sister is the same way. The parents spoiled her while being hard on me and she expected the entire world to trear her as if she was special. As an adult, she is prone to screaming tantrums over the slightest disappointments and blames me for the fact that she doesn't have more money.

As bad as I feel for your parents, I believe they did not fulfill the responsibility of protecting you or making sure your life was fair. Its admirable that you contribute to the family, but if I can offer some advice, try to save up money in a bank account that your family doesn't know about. I'm in loads of trouble because my family got control of all my money and now they make me work for free and I can't leave. You can still help your parents and give them moral support, but it is important to have control over your own life and be able to leave of you need to. I hope you won't take offense at my suggesting that your parents didn't do right by you. I just don't want to see someone else end up in trouble like me. Good luck. Take care of yourself!