I already did this, but it didn't post!
I'm pretty terrible at introductions. My name is Julie, I'm 26, and I guess my lucid dreaming started when I was 16. Around that time I began to have sleep paralysis. Anyone with SP experience can agree that the nightmares from it are pretty terrible. I started to use it as a doorway into lucid dreaming. I can wake myself up from sleep paralysis, even move a little bit, or I make the nightmare less potent. The thing that should have been scary is then just something interesting.
I have only had a few dreams where I was intensely lucid, meaning that I could manipulate everything in the dream. Most of the time I'm just aware I'm dreaming, or make decisions clearly outside of dream logic. I never have flying dreams, but when I lucid dream I'll choose to jump great distances or to run.
I have a problem with reason getting in the way. For example: in one of the few dreams where I actually created something out of nothing, I made a horse. The image in my mind was more like a painting, or a statue, so the horse wasn't breathing. I had to will it to life.
Sometimes the dream figments refuse to cooperate. Once I tried to have a sexy dream, and none of the men wanted to participate.
Me: Didn't you hear me? I said...
Him: Yeah, I heard you. I don't want to.

I guess that's it. I'm glad I found this forum =)