Why do my parents yell at me a lot?

You're parents yell at you because of their own experience. For example, that's what they have learned to do. They have learned that yelling is a way to get what they want. A way to control and manipulate others so their world feels safe to them. They can't perceive how this way of being affects others. It's their reality. The only way they are likely to change is if they learn something different. Maybe that they don't have to struggle to keep their world together by yelling at you. They will only learn something different through insights into their behavior. For instance, how that behavior impacts on you. Knowing this information might help them perceive their behavior more clearly. And when this happens, they are more likely to change their behavior for the better and stop yelling so much at you.

While I can't for sure tell you why your parents do that, it's certainly not an uncommon thing that happens, even though it really shouldn't ever happen. Your parents might have certain expectations of you, and if you're not meeting those expectations this can upset them and cause them to yell at you. This, of course, doesn't mean it's your fault by any means. Our parents come from completely different generations, and they might not really understand you all that well, nor the fact that yelling doesn't accomplish much except hurt you. I'm really sorry that you're dealing with that, but just keep in mind that that, too, shall pass.