I am financially abused by my parents.

I am 24M, working as a software engineer. My parents are not educated (although I do respect my parents). A few years ago, they bought a lot of small amounts (like 20K, 30K, and 40K) from multiple non-bank finance companies as well as local money lords. They recover loans in small amounts over long periods of time, such as twice a week or once every 300 or 400. The interest rates are so high. Initially, they used that money to buy jewelry for my younger sister's marriage. 

The issue is that over time, my father had no job, so they started to get more loans to pay the previous loans and some other expenses. They ended up pledging the jewels (they do this all the time). Two years ago, I started my career. Initially, I had a very low salary, so I couldn't fully support my parents.

Then I started freelancing part-time jobs to earn more to fix my family debt (me and my parents are the only ones earning). I had requested that my parents not have any loans or gold pledges. They never listen to me; they keep doing what I have done: pay off lots of their loans and save the jewelry, which seems to be taken over by pawn shops (high interest). They never used banks. I saved them for my sister's marriage, but again, all they went to was where I saved them before.

Now the situation is so bad. We are planning to fix a marriage with my first younger sister. I had nothing in my hand—no savings. They wanted me to have a loan and spend it on my sister's marriage (not fixed yet) and to save the jewelry. I already took out two loans and paid them all. I had no savings, investments, or insurance; I never had the things that I loved most.

What should I do?. I have a girlfriend, and her parents are planning to arrange a marriage. How can I convince her parents with this kind of family?.