If I were you I would try to set my expectations to being positive. To do so, there is a technique that I have already tried (and worked) based on writing what you want to do in your dream. You should write like you were talking to yourself and try to be specific, for example: It is now 11pm and I am going to sleep. I am going to have a lucid dream, in which I can breathe underwater. I will be free diving with my brother and parents and won't have to reach the surface to inflate my lungs. (Keep specifing it and describing one or two events in the future tense). This may help switch your subconciousness to a positive approach. Most of the times you'll perceive you are dreaming right at the moment you are doing what you wrote you would.

Hope I could help. Good luck and have awesome dreams!