learning English

Hello! I want to say something that about for me ; learning English is difficult because I don't know HOW I can remember the vocabulary,then I think that I haven't got neurons, I don't know. Another problem that I have is that when I want to talk in class , my mi brain goes to holiday and then I say NOTHING. I know that I have serious problems about with my shyness. I need help!

ps: I am not sure about ''I say nothing''. Maybe right version of this sentence can be like ''I can't say nothing''  

learning English

Hello! I want to say that for me, learning English is difficult because I don't know HOW I can to remember the vocabulary, I think that I haven't got don't have neurons  ??????????, I don't know. Another problem that I have is that when I want to talk in a class mi brain  my brain goes to holiday ?????????and I say NOTHING. I know that I have serious problems with  because of my shyness. I need help!