Perhaps it was just your last sentence, but you don't know what's not real and what is, you're not lucid dreaming. The definition of lucid dreaming is to know you are dreaming.
Anyway, about that issue, try practicing reality checks. Reality checks are usually things that defy the laws of physics as, within dreams, there is practically no such thing as physics. Block your nose and attempt to breathe through it, try and poke your finger through your hands, try jumping (to test the gravity). I hope this helped that particular issue. Do ask if you have any more questions.