1st problem you were struggling.
You should not be thinking about stuggling, not be feeling any anxiety to keep the dream alive, neither should you try force the events as they unfold, typically for new learners to lucid dreaming. I guess by this being in the newbie zone you are new to lucid dreaming.
How often do you have LDs and are they usually like this? If you have only had a couple you will find that they are often short lived. Which is the way for most people, the longer the time period you have them for the longer they last. It takes time and practice. But it is important not to think as soon as you come lucid to try prolong it.
Think of it this way, you are already dreaming, and normal dreams last for a fair mount of time, and by you panicing and having the mindset of worrying about it ending, or how you are going to prolong it will take your mind away from creating the dream, to ending it.
When you next become lucid just follow the dream as it was, so if you were in a field or in the city or something then just stay there, try not to do anything ground breaking like bending time and space, but instead just study the environment around you. Look at what is around you, breathing in the air and feeling the wind on your face, smell things, and study things, you will find as you relax and appriciate the dream, that you will steadily increase the clarity and vividness of the dream as your mind stabilyses from the dream state to the lucid state.
There are so many more things you can try if this doesn't work for you and happy to help if I can 
Welcome to the forum by the way.
Adam.
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