1) Converse a lot - you will grow more comfortable a make less mistakes over time. There is no substitute for conversation 2) Write on a regular basis - you are already doing this - great job! 3) Talk to yourself if you think you are too shy…but being too shy is often because of not enough 1) 4) If it's a possibility, get a native english bf/significant other who only speaks english. This may be the funnest way to improve:)

I would recommend listening to Luke's English Podcast and Learn Real English

Talking from experience, you can do two things to improve: (1) Do lots of listening to authentic English material (2) Talk to someone regularly Btw, I can help you with the latter part :)

I already knew that... :) I'm too shy to improve my speaking skills, even if i know some great idioms or structure...when i must talk with someone, just few minutes more I do a lot of grammar mistakes, use only simple sentence...

Writing is a key, because you have time to think. And if you want to speak you should speak as much as you can in English. You can find a native speaker or a teacher who can help you.