I agree with Bardou that we're dealing with different cultural norms in this situation, and possibly the police wouldn't be supportive. Perhaps there aren't any police.
You could research "freezer spells." Put your intended husband, his family, and your family into the container and put it on ice, so to speak. Obviously you're not putting them in a container - you're putting representations of them: a namepaper, some hair, whatever you have and can create into a jar that can be put on ice. If you Google the term "freezer spells" you should be able to find examples that you could modify.
I'd try this first before attempting to control their thoughts. It seems a bit simpler for a beginner to manage. If you want to try something else, you could certainly search for "controlling spells" and see what comes up. The few that i know employ a skull-shaped candle to get into the person's head.
I can't imagine how you feel. I would be devestated if i was in your situation - maybe. Also take comfort in the fact that for thousands of years other women have been in your position. Many women have gone before you and they have made their way and made a good life for themselves. Sometimes surrender is our only option. Life is not meant to be all easy and happy. Suffering happens, and a greater mark of a person's spirit is how they navigate through suffering. All of us do well when life is easy and pleasant. The true lessons come when we work through the hard times. Perhaps your parents are making a decision that they believe is best for you? Perhaps they are very wise? Best of luck.