Non-native English creators: How do you show natural emotion on camera without freezing up?

English is not my first language. I lived in Canada for a few years, but I haven't used English regularly in a while. I recently started making short talking-head videos on TikTok, and I'm really struggling with one thing.

When I try to bring real energy and natural tone to the camera, my brain completely freezes. It feels like my brain can't handle searching for English words and showing natural emotion at the same time. I end up either sounding awkward or like a robot.

If I memorize a script word-for-word, I look like I'm reading a textbook. But if I don't use a script, my speaking falls apart.

For other non-native creators: How do you handle this? How do you stay natural and expressive on camera without getting stuck in your head?