Just believe yourself.. That is the Only way to avoid your shy and nervous.. And try hard is nothing matter..just enjoy your learning...and then definitely you will get positive result:) All the best..

just practice reading books, articles, newspapers loudly one or half hour daily. you gonna start getting confident in 1-2 weeks depends on you.

"Feel the fear and do it anyway."

because i 'm not confident, i'm afraid of making errors when i speak English, however, i dont have many an opportunity to practice English

I have the same problem) But I've found the good teacher on italki. And he helps me to feel comfortable. The most important thing is to speak more: with yourself, with friends etc. Why are you nervous? What is the reason?