No problem! You are starting out from a great base IMO. Experiment with lying in bed for a moment, gathering your dream memories into your mind, and then move for your dream journal.
Write down everything you can remember, without judgment. Take the time to put it to paper as best you can. Try to trace back from the fragments to other fragments and attempt to reel the whole dream back in if you can. If you can’t get much this time, no big deal! This is part of training yourself to connect more deeply with your dreams. It’s all valuable and it will get better over time.
Lucid dreaming is a process. Trust the process and stay patient and forgiving with yourself. It’s not hard per se – it’s just different from other things that you have done before! Give yourself time to learn it. But understand that you are fully capable of having lucid dreams. In fact, I think it’s critical that over time you think of yourself as someone who becomes lucid in dreams. It should become part of your expectations in the dream world. And it really is true!
So definitely drop the idea that you can’t lucid dream. It’s likely to hold you back and it’s false. Think of yourself as a kid who just fell off a bike after trying to ride for the first time. It’s not that he “can’t ride a bike”. He simply has to take time to learn how.
And later when that kid is racing around the neighborhood at top speed (with no hands), we’s going to wonder how he ever convinced himself that it was so hard. 
Take the time, put in the work, and have patience. (Like, months of patience.) And yes, I sound like a broken record these days, but I second Lucere’s recommendation of SSILD (which you can check out here.) This is what I use.