Welcome to DV! It sounds like you've started on your way to lucid dreaming quite well. To me, recall is one of the most important foundations for lucid dreaming - without it you won't be able to remember your dreams!

As you said, you've already identified your problem in that you feel as though you can't do it. This is more than likely what is holding you back! If you simply allow yourself to know that with time you will achieve a lucid dream then they will come! Lucid dreaming isn't inherrently difficult - a lot of beginners exaggerate how difficult it can be to get a lucid dream. Relax, and go to sleep knowing that you can lucid dream!

If you haven't already , check out the Beginners Guide to Lucid Dreaming and the Wiki, there's likely a few little pieces of information in there that will help spark your confidence and get you that lucid dream!