Very difficult to tell. My work is most confused at how much my fluency varies and I think at least one coworker thinks I'm faking it. When a face to face interaction is straightforward I have almost no issue picking words that will be easier. If I have to explain something to someone I do more umming and uhhing and weird volume/pace changes. If someone is rude to me I have two modes I can fluently be rude right back or I basically say as few words as possible to avoid a bad time. On the phone half the time I'm fluent with my fake fake fake friendly sweet phone voice UNTIL I have to read a number. I also spell things or one letter at a time like B as in boy, Z as in Zebra. Where I work it comes off as a clarity measure... like something I'm doing for accuracy vs fluency. I also hate leaving voicemails with a call back number I always have to repeat 2-3x on tape, hang up and have to physically shake out the tension. After that face to face can be better or worse depending on the day I'm having. Anxiety gets my goat is my problem and I get in a bad mood and get apathetic, sometimes rude. I also lean on sarcasm and swearing when I feel like this to be fluent and I don't recommend it but it's what happens. Sometimes the swearing makes me more relatable to the kind of people who casually swear but you may not want to become a sailor like me.