No that's not true. It's easy to think about the fact that you could be dreaming, and do a test without being Lucid first. That's what the test is for.
Well if you knew you were dreaming already, then you were Lucid. Just a low level. you'll probably have better luck next time.
Don't worry about being retarded in your dream. We all are! It's very easy to get confused in them.

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