Congrats mate on your first lucid. Not the last one to come either.
thats kinda a hard thing to say. Think about it this way, your in your own world where you know that everything is a creation of your mind. but its the first time that you have ever been in this world were you have known this. Suddenly there is a chance taht you will fall out of a car going really fast down the road. Even though you know its a dream, its all so real. you feel fear.
That is normal. 
even in some of my lucid dreams i still get a little scared about something. i mean to us it reall y is happening in our heads. practice and get used to the idea and you wont be scared anymore. just keep telling your self it is a dream and no probs.
you should def try again! trust me it is worth it.
here are a few links to places around the forum you should check out.
and soon you will be posting in here as well
some of these are long, and they are basic as well, but take a look around the forum it will help. good luck