Is it normal to act dumb when someone has anxiety?

I have anxiety and I feel like I have brain fog all the time and I feel stupid like Im absent minded. I stutter when I talk. Im slow to respond like Im always confuse. But sometimes when it doesn't attack I can easily respond back. I've been called dumb because of this. Sometimes I just think maybe Im just not smart. Does anyone feel the same?
Is it normal to act dumb when someone has anxiety?
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