Hello,everyone.I want to know how do you pronounce "i" in the words?

what is the dirrerent between"six" and "sex", "sit" "pig"

My oral English is poor,I can't speak standard word.Please tell me the way if you know

Hi,everybody,Iwant to find a language exchange partner who speaks English Hi,everyone!I come from China.I want to learn English so I am looking for a Language-exchange partner who speaks English(mother tongue) and want to learning Chinese.Please contact me if you are interested.