I am almost always fluent unless i think about it. I know which word is difficult for me or the situation where I have to present something and everybody will listen to me. In that kind of situation I become so nervous that I just can't utter a word out of my mouth. I think there is a lot to talk about which is not possible to write here. We can discuss these things in voice chats where we can help each other out. Is there any voice chat group??