Practice, practice, practice! I know it may sound obvious but you have to continually practice speaking English before you can become a fluent English speaker. Why do you remain silent in your English Language Class? ("i remain quiet all time")
Ask questions frequently in this forum and then verbalize the answers that you receive. This will help you gain confidence.
Also, it would be to your advantage to complete the registration form using your online name and your location. Members of this forum respond quickly to members who provide a little personal information ( i.e., name and location). Those who remain "unregistered" are often ignored!
I hope we see you often in this forum.