Yoga makes me extremely anxious, anyone else experience this?

I have tried 4 yoga classes now. Yoga is suppose to be calming. But it does the exact opposite for me. My axiety is way way way up, after yoga and in the middle of the class.. I am constantly shaking (It's not because the moves are hard, it's because my anxiety level is so high.)
Yoga makes me extremely anxious, anyone else experience this?
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