Could you tell me how to talk with someone in a foreign language?

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Last night,I went to the English corner,that is my first time to go there,because I am afraid that I can't follow them,I think that it's very terrible if I can't understand them.At last,a girl who majors in English,her English is very good,I only understand her a little,and said little,she said to me:"You should be opitimistic,don't be afraid of making mistake,open you your mouth,and talk with me bravely and louldly.It is my first time to talk with someone in English,not too bad,I think.How about you?and who can give me some advice?I like English.