Taking control of your dreams is not as simple as figuring out you're in a dream. Sometimes it's nice to not take control and just walk around to see what kinds of crazy random shit your brain comes up with.

I'm not sure what happened in your dream since I don't know what was going on in your head at the time, but perhaps you were overwhelmed by the surprise of finding yourself in an imaginary simulation of reality. I've had lots of lucid dreams and it still surprises me very much when I come to that unusual realization. It can be a lot to take in, so much that sometimes you don't even know what to make of the situation.

My suggestion would be to think of some things you would like to try in your next lucid dream, and keep reminding yourself what they are. Next time you have one, hopefully you will remember your list and start experimenting. Some things I like to do are flying (of course), running at 200 miles an hour, having crazy sex with lots of random women, making things explode, going on GTA-style rampages, and using my super kung fu powers to fight people like in the Matrix.