Is there such a thing as "normal"?

Or is the idea of “normal” just something that comes with perceiving that our own thoughts and actions are not a certain way or how we want them to be?
I have trouble understanding the concept of “normal.” Admittedly, I have uttered the phrases, “I’m not normal. What’s wrong with me?” but I have never thought about what it really meant to be “normal” in the first place.
Is there really such a thing as “normal”? Is it a template of expectations to be met?