What is the purpose to study English for me

English has been recognized as a world language by almost all of the people in the world. I don't know the exact reason but I guess it is because major countries such as the US, and the UK use English.
Therefore, new and informative information or ideas occur in English,which causes non-English users to lose a chance to approach them. In the academic field,this phenomenon is obvious. When we see every world university ranking, they are full of universities in the US, the UK, or other English-speaking countries.
Not only in the academic field,but in the entertainment industry. Famous film production companies in the US make large-cost big-budget movies which are really great and totally different from their counterparts from other countries.However,actresses and actors performing in these movies speak English,so non-English users cannot understand what they say or they have to wait for dubs or subtitles which are actually a bit distorted in terms of the actual meaning in comparison with to the original movies due to language difference.
So I want to master English so that I can reach high-quality information,works and ideas from English-speaking countries.