What makes me the biggest problems in English?

I will sort them according to my importance, however if I am wrong, please correct me ;)
 
Firstly, it's definitely the word order because it's different to the Czech grammar. I usually don't have a problem to find words and compose a sentence (OK there are cases where I have problems like after heavy drinking and so on) but I am not always sure about phrasing.
 
Secondly, as English isn't my mother tongue, I have also problem with the definite and indefinite article. However it bothers me less than phrasing because I think that using of article doesn't change the meaning of sentences. Moreover I remember my English teacher (he was translating to Mr. Adrian Basora - USS Ambassador to the Czech Republic in 90's) who always said with exaggeration that even native English speaker sometimes doesn't know where to use the definite and indefinite article.
 
Thirdly, it's the nonliterary language. Yeah, it also stems from being a non native speaker and it usually goes beyond my understanding.
 
Fourthly, it’s using of all those abbreviations. I know only BTW, FYI, AKA, ASAIK and maybe a few others which I cannot recall now. The rest is a nightmare.
 
Fifthly but it stands quite aside of this rank because it relates just to talking and listening ... that's the speed you, English people, speak. After two or three sentences I cannot catch you. You're like a machine gun. Watching CNN, BBC etc. is somehow OK for me because they speak to wide audience, not only to the English one, so they try to be clear. Nevertheless watching MTV, VIVA or listening to radio or speaking to the taxi driver or buying a hot dog in stand on the street is frustrating.
 
So, hope you took this read with ease and you laughed a bit, what was the only purpose because the spring is finally here, temperature goes up and sun is shining more and more :D
 
Have a cheerful and positive mood.
 
Petr AKA pegas
 
BTW, don't hesitate to take a red pen and correct this article how it should be to comply with the English grammar or if do you think that I omitted any other problems I have, please add them  :D