I can't be my own person

I will admit I am pretty spoiled. My parents pay for my car insurance, college, and rent to live on campus. I really appreciate everything my parents do for me and I'm grateful for what they give me. However, I feel like I'm being held on a leash. Everything is constantly used against me as a threat because I'm "on their money". My mother constantly threatens to stop paying for my sschooling or rent if I do something against her wishes or if I behave poorly in some way. I am currently going to school for a major my parents picked, not what I wanted. I cannot switch to what I would prefer because it's "their money". My mother also gets mad if I drive my car "too much." Why do I even have a car if I can't drive it?? The other day I drove to the next city over and my mom called to scream at me. (She can see when I drive because it emails her). She screamed at me that I drove too far and she doesn't want the insurance going up. I pay for gas and I don't even drive it that much. The car is 3 years old and has less than 10K miles on it. Earlier this evening, my mother also sent me a screenshot of a post I liked on social media. She sent various messages scolding me for liking it because we have different political views and she believes this stand to be in the wrong. I feel like I can't even be my own person with my own views. I feel constantly stressed and threatened like I only exist as a pet of my parents