It actually just depends how close your language is to English and how exposed you are to the English language (which is probably all the time, English is the lingua franca of the world)!
If you're having a hard time understanding/ learning English, don't feel disheartened especially with most people saying it's the easiest language to learn. I had a difficult time learning English as well, but like everything you should persist and persevere.
English is constantly evolving and the words come from all over the place! Plus, there's the pain of pronouncing everything right and whatnot. Just keep soldiering on and I'm sure you'll get the hang of the English Language.