Happiness is a state a mind, not a dress size.
Take your time, teach what you love, be unabashedly you, and try not to compare yourself to someone who's been teaching longer than you.
Know that your style will always change and that nothing is ever set in stone.
Everyone needs to start somewhere.
Just because you don't like it doesn't mean it isn't currently rocking someone else's world.
The self doubt can be a fantastic opportunity to self-reflect and see where you can grow and be stronger.