Wow, excellent English, your hardwork and studies are definitely paying off. I'll just correct the very few and far between errors or unnatural sounding phrases I found so you can improve just a little more. 

Learning a new language from scratch

The first foreign language I have ever tried to learn in my life was English, which I started to learn at school when I was very young. I [I've sounds more natural, though this is also grammaticaly correct] always liked it, although now I like English more than I ever had. I always liked to hear [hearing implies a noise, you physically can hear it, but listen is the verb most often used for music] music in English and to watch American films and TV [should be capatlized, it frequently isn't in informal conversations, but if you're going to capitalize American, TV should also be capatalized] series. But, you know, watching a tv series or a movie in original version, hearing the original dialogues between the characters and the jokes, is way more fun and amusing than watching it in your native language or in original version with subtitles in your mother language.
In the past, I was interested in poker, but I found out that most of the good players and people who know the most about the game and were worth listening to, were from English-speaking countries, so, in order to improve my poker skills I had to improve my English to at least a level in which I could read good articles and sort of understand them.
That's the reason why I started to learn the language on my own in the first place, since before this I only studied English in order to pass the school and high school English tests.

What an interesting reason to learn English! Has it helped your poker game? If you're interested in any more practice, check out my classes!