I had no idea that not everybody could have lucid dreams. I've always been able to. It can be quite disconcerting at times not being able to tell three difference between walking around your own home/garden (remember I've always lived in places with larger gardens up to and including 999 acres (I'm not kidding) including mountains, tarns and streams) right up until you notice that there is no smell/fragrance only the knowledge of the fact it smelled good/bad etc or you walk through something and there's no pain again only the knowledge that it should have or did hurt. Or you have just walked into a room that isn't there etc.
Lucid dreaming takes things a stage further. Its not simply becoming aware that you are dreaming. That does happen to everyone I think, sometimes. Lucid dreaming is being able to control what happens in the dream whilst being aware that its a dream. So, for example, you can decide you want to conjure up a person to talk to (or do other things with! ) and they will appear.