I hate the way my mother treats me
I (M26) am the second eldest of my family (1 recently married older sister and 2 younger brother/sister).
My mother doesn't work, and she never had to, as my father was bringing more than enough to feed everyone. The problem is, after 30 years without working + aging, she simply can't work anymore.
My parents divorced not long before my older sister's marriage. As of now, I am the only one working at home, so I am paying for everything.
To comfort herself after the divorce, my mother wanted to throw an incredible party for my sister's marriage. Problem is, she had no money, so I paid for it, but she and my sister promised they would repay me at some point.
It has now been 3 years, and I never saw a single coin of my money. Until now I didn't have a problem with, but now I need money for a personal project (I want to start a company) so I went to my mother and sister to ask for this money back, which she gently replied : "you are the most stingy and individualistic person I have ever seen in my life, you would dare to ask for money back from your own family ? You truly disappoint me" (she used the same words, but I summarized it for you, it was a 1 hour 30 minutes acid-vomitting monologue)
I wouldn't mind if she was the same with everyone, but the problem is, my sister paid something for my mother recently (a bit under 200$)... And she came to me every single day for a whole week to make me pay her back...
My mother has been a truly awful person ever since she divorced my father. I know what you are going to tell me, I should simply leave. And you are probably right, but I am not individualistic enough I guess... I think about my two younger siblings, they can't work, thay are still struggling to find what they wish to do in the future, etc. I just can't resolve myself to leave them.
Anyway, I hate my mother, I hate her way of life, I hate how toxic she is, how much of a burden she is in my life. I don't know what to do, I first thought I was in the wrong so I went to a psychologist, and she told me I had to be firmer without disrespecting or hurting my mother... well easier said than done.
What can I do now...?