Out of one's element

Meaning:

If we are out of our element, we are in a situation that makes us feel uncomfortable because we're not used to it. We usually don't enjoy being out of our element.

Example sentences:

1. I'm out of my element here.
2. He is way out of his element.
3. She doesn't like to be out of her element.

Example dialogue:

A: How do you like living in the big city?
B: Well, to be honest, I don't like it so much.
A: Why is that?
B: I grew up in a small town, so I'm out of my element in the big city.

Practice:

Can you think of a time when you were out of your element?

Also see: In one's element