Growth is HARD. Anyone who tells you otherwise is almost certainly not growing.
Growth requires discomfort and hardship. For periods of time, you might feel like a moron, or at least an absolute beginner.
It's natural to question your sanity. Why did you leave your cushy existence to tackle a new challenge, learn a new skill, or reboot your entire career?
You did it because you are capable of more. Much more. You did it because you are brave and strong and willing to endure hardship.
You don't need it to be easy. You just need it to work.