You know when you're trying not to think of something but you can't get it out of your head?
I've found that my experiences with lucid dreaming are like this. Let me explain: whenever I'm inside a dream, and I decide to RC, I become lucid. I then proceed to get overly excited (which can make the dream unstable.) I start touching things, trying to anchor myself in the dream. But, I cannot stop my mind from thinking: "Wow! This is a dream! Don't wake up! Don't wake up!" And this ultimately leads to me waking up within a few seconds of becoming lucid.
So, back to the title: "You know when you're trying not to think of something but you can't get it out of your head?" - Well, that "thing" that I am trying not to think of is waking up, which inevitably happens whenever I try to get that out of my head.
It's just like that Inception quote about the White Elephant.
This might be sort of vague, but any help/comments would be appreciated here.