practice is the key to success

As Badr said : " practice " 
And you must know that : If you want to reach the top , you should work hard - and smart - for reaching it .
It is said in Arabic poetry : 
لا تحسبن المجد تمراً أنت آكله ،، لن تبلغَ المجدَ حتى تلعقَ الصّبرَ 
It means : 
Do not consider the Glory as a dried dates , as dates is easy to be eaten . But you will get the glory when you lick the patience .
I hope you get the meaning ^_^ . 

I think that we learn languages to use them, to help us solve communication problems but not to mere show off. Even native speakers make mistakes. So you shouldn`t be afraid of mistakes, just learn languages. Pracice makes perfect.

Thanks all ! It's very helpful advice :) . Nice to meet all of you !