I have always considered myself as a long life learner. It means, although I am not studying English, since I am already an English teacher and professor; I have always thought, learning a language is a process where you are always acquiring and learning itself. It is amazing how every single day, I learn a new word, an expression, or even I recall or remember some words I have learnt, through this schooling process, and I have not used them for a while. All this is just one of the aspect I can mention about my learning process, which is also align with the idea of practicing and improving my skills by performing activities such as: Listening to music, watch TED videos, listening to conferences, lectures and academic presentations, reading authentic materials (mainly literature) and of course, finding excuses to practice my speaking (everyday conversations) with colleagues, students and friends who either speak or know the language.
Now, as an English teacher, I have heard millions of reasons people have to study the language, they range from personal matters and interests (like of the language, desire to travel abroad, interest in the music) to institutional requirements and policies that ask people to study it in order to graduate or receive a diploma. There are also those people who have to take international tests to either study a post-degree program overseas or to apply for job that requires this item as part of the selection process, and they have to do it as the main reason to study this foreign or second language, depending on the situation and context they are in.
Regardless the reason you have or have chosen to study English, my advice is to do it with passion, look for constant and appropriate practice and always remember, errors and mistakes occasionally occur, even in your language one, so do not feel intimidated or bad, if you make a couple of them, from time to time, when speaking or writing, just do it, and feel happy with the little achievements and improvements you get while working on this process of being proficient in a second or foreign language.