Well thats natural. You should do what Micheal and others have suggested and start a dream journal, which will helps quite a bit. (Strange though isnt it, all your doing is writing down your dreams =/). You might try the Straight Back to Bed method, that works 100% of the time for me in term of lucid dreaming, also do RC's frequently in real life until you find yourself doing them without truly giving it thought.
Good Luck and Live long + Prosper .