I know this feeling as well. I have tried last year, but then I stopped after not succeeding (bad idea) and now I re-started trying to achieve lucidity. To be honest I really regret having stopped....

Even though you might be disappointed at times because you didn't really get there yet that really doesn't mean that you're getting nowhere! In my opinion it's not all about lucidity... As Joanna said there are many more benefits like learning to analyse and enjoy your dreams more and being more aware in your daily life. Isn't that something great? It might also be helpful not to try too hard. And whenever I feel a little demotivatied I just read DJs of other forum members or watch topic-related movies and that always inspires me to keep going.

King Yoshi's guide about ADA really helped me heaps. You might want to read it if you haven't done that so far. I've instantly had my first lucid dream after re-starting and my dream recall has improved dramatically since then so I think ADA is great for achieving results fast