Essential skills like riding with one hand and getting out of the saddle are harder to start when you're an adult.
First of all, your center of gravity is completely different. A student can feel heavier or that it's farther to fall when you're taller as an adult. Developing the confidence to move through the fears and find a new sense of balance and fun takes time and practice is the key!
See more about essential skills here in past posts and newsletters!