You did say something interesting. You said, „English is my second life.“ I like that because I think it’s very telling. I’ve mentioned this here on Italki before, but I’ll do it again in case you missed it. My second language is German, and I started learning it when I was 19 (I’m 59 now). The instructor at the university had us buy books for the first year, so I went to the bookstore to buy them. One of the books had a title like „500 German Verbs“ or something, and when I opened the cover there was a quote from Winston Churchill (I could be wrong, but I don’t think so, it’s been 40 years after all). The quote was „To speak a foreign language is to be a different person.“ I liked that. And, it’s true. It’s almost what you said about a „second life.“ Knowing a second language allows you to step out of your shoes for a little while and almost be someone else, to connect with another group of people, another culture. It allows you an escape from might otherwise be a drab world for you, even if just for a little while. And, I think that’s a good thing, no matter what language you learn. 

I study it because it's very useful. It would be a big "plus" if I can speak in English fluently and correctly, for my future job. Also English is a "key" to the doors of different culturies and history.

English has no unified culture to attach to. Which one? It's like saying one loves the Spanish-speaking culture. Take a look at a map of central and South America, excluding Brazil and Guyana, and I'd like that person to tell which culture he or she is referring to. They're all different you know. 

I started to learn it to help me develop in my work and to know more by reading in several subjects, I loved the movies, series, books, and courses related to my study .. but I'm still in the beginning  

for the convenient of  learning , studing and using western science and technonology