I am trying to get used to phrasel verbs

One of the difficulties to learn English is phrasel verbs. It's totally different from my native language. We don't use it, and I hope we definitely won't use it in the future. So complicated. Phrasel verb means a mix of verb and preposition. It's very useful in speaking. If you use it in your writing or speaking test, you will definitely get good score. I still haven't figured out how English speakers came up with phrasel verbs. In my view, English isn't organized language. Someone who spoke English created it. I would like to ask him or her who created it that why you didn't use normal verbs instead of disgustingly complicated phrasel verbs , and if you didn't find something else to do.