Thats totally normal, especially because everyone tends to over think gesture drawing! The gesture is the energy movement of the pose, so the more loose you are the better the gesture drawing will be. I recommend getting the biggest paper you have and a brush marker or really soft pencil and tape the paper on the wall, then stand back about a foot away and practice making really sweeping c curves and s curves. Then in the same set up start drawing noodle people (stick figures but using c curves and s curves) preferably one person per paper (so they stay big). Drawing faces and hands is not advisable in a gesture drawing, proportion is only a bit important also—the main thing is getting the movement. After those two exercises you can pull up pictures or use this website line-of-action.com on the 30 sec mode to just get comfortable trying to lay down these loose lines and capturing the movement quickly. Gesture drawing isnt really ‘drawing’ its more slapping down what you see as messy as it needs to be
Here is a link to their tutorial https://line-of-action.com/learn-to-draw
And a relevant screengrab
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