My first ever lucid dream and I missed my chance to do something I'd never be able to do

I remember being in a small dark room with a friend of mine, we were talking about something that I don't fully remember when he suddenly told me that I was dreaming, which surprised me a bit, so I took a look at one of my hands and sure enough, I had seven fingers, then I realised that it was a dream, I became exited but I knew I'd have to calm down or risk waking up, so I made a chair for myself and sat down to think about it, after I'd managed to calm myself down I noticed that there weren't any doors in this room, so I'd have to make one, pushed on a wall and it didn't move, pushed on another and it opened, I was in my friends house, there was nearly no light at all and I ended up painfully falling down the stairs, once I'd recovered from this I stepped outside only to find that the sky was red and huge dragon like creatures were flying around, since I knew it was a dream I knew I could do what I wanted and decided to fight the first person I saw, unfortunately I woke up soon after a man carrying watermelons ran at me with a small purple knife.

I've never had a lucid dream before and apart from my reccuring dreams I've never been able to remember even the slightest details of any of my dreams. This dream was almost too vivid for me to comprehend.

But now I realise I couldve done much more than I did, like flying is supposed to be a relaxing thing to do, but would this have woken me up?

However I have to ask, does any part of my dream being so dark and creepy mean anything, and what are good ways to be able to make my lucid dreams more stable and longer lasting?