It is the subject matter that determines the language you need to learn. Focus on relevant language to you. If you are looking to travel to an English speaking country focus on the language needed to communicate. If you are studying for a PhD focus on academic studies. If you are looking to meet new people and socialise focus on conversational English. Find your hobby and do it in English - this will keep you motivated to learn, and the learning process will become enjoyable.
Confidence is fundamental to communication, an important step to the whole process and enjoyment. To speak English you actually have to speak English, to become confident you need to use the language. You need to step out of your comfort zone.
No native speaker is perfect with the English language, they may use the same words time and time again, or make grammar errors, guess what? That’s okay! You don’t need to know ten of thousands of words to be fluent in English. You need to be able to understand the language, get the feel for English. Every day you can continue improving.
