A mistake.

I'm feeling really depressed. Yes, I can do English a tiny little bit but I can't get a feel for it.

Air of conversations, I have no Idea of it.<= Really not sure what you mean by "Air of conversations", maybe "gist"?.

So I tried to improve/practice by chatting with real Americans and other English speaking people but while I was (past tense) doing it I made a mistake saying something that was rude or so bad I think. Someone said to me 'I would go to kill you' or something that I don't remember exactly. I send messages saying "I'm so sorry" (to the individuals individually) but nobody answered me. I'm so sorry for those guys but it's really annoying that I do not even know what I said that went wrong. Eventually I left (past tense leaved) that community site.

I don't much care about internet sites or social networks but this time I feel depressed. Really.

I think the last two sentences are incomplete, I suspect you were trying to say that you didn't care that about what people thought on social network sites normally, but that failing to communicate with them this time has made you depressed? But that's a lot of guess work to fill that in.

Actually reading your entry, I can get a feel for where your at in your learning. Your far more advanced than basic English, but just falling short of fluent. Perhaps try kicking your English back a touch when your using it, keeping it simpler for a while, while you learn practice more?

Anyways I hope this helps. Good luck.

  Cellulos:

 You might try working with me a little bit.