How is “have your doubts” used?

In The Dawn Wall (2017), one line is: “I really had my doubts as to whether it was going to be a viable climb.”

Which movie is “have your doubts” from?

The clip at the top of this page is from The Dawn Wall (2017).

I really had my doubts as to whether it was going to be a viable climb.

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to have reasons why you are not certain about whether sth is good or whether sth good will happen

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to have reasons why you are not certain about whether sth is good or whether sth good will happen
I really had my doubts as to whether it was going to be a viable climb.
I mean, trust me, I had my doubts after your whole jam debacle.

定義：Oxford Advanced Learner's Dictionary 第 9 版