Hi! The easiest way to learn a language is to expose yourself often to the language. For example, change your phone or PC settings to English, listen to shorts news in English (there are many websites available online), watch English movies, and talk to someone in English. Actually, there are many things that you can do to expose yourself to the language, but there is only one thing that is harder-- consistency.
Assess yourself and if you still cannot tell what's wrong, then maybe I can help you know more ways to study smarter. Whatever frustration you're feeling now, that's all normal and part of the learning process. Don't give up! 😉