i dont know if you will laugh at this advice but i think that the best way to raise your confidence level in spoken english is work where you have to interact with people constantly. I have seen that people who work in restaurants ...in a bar or waiting ,whatever are more comfortable interacting with people. may be you could try out a part time job for some months. And you should study . people before me have given you very good advices. its really important to have knowlege for a good life.