How to improve oral english?

hello, I'm chinese, and my english level is CET-6.  Although it is no problem for me to read papers, my oral english is just so-so. I‘m easily nervous when talking to foreigner, I'm afraid to speak wrong words and misunderstand their meanings. So,what do you think for this?

很多人在学习一门语言的时候，由于不擅长交流造成了哑巴语言的状况，如何克服这一缺点，大家可以畅所欲言！