What does “be set in your ways” mean?

to have habits or opinions that you have had for a long time and that you do not want to change

How is “be set in your ways” used?

In The Way Way Back (2013), one line is: “You should. Put your stamp on it. I'm not set in my ways.”

The clip at the top of this page is from The Way Way Back (2013).

You should. Put your stamp on it. I'm not set in my ways.

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