I gotta say congrats. Nearly every person who tries this initially posts very underexposed pictures, and these really are not. You've already got one of the tricks down.
You also have stars on your light sources because you used a small aperature, which is another trick most people don't manage to get (not sure if that was intentional).
From a purely technical perspective, this was a very good first attempt. Congrats!
I know what you mean about being nervous about being out at night. I usually try to bring a couple friends with me and we all shoot together. Keep it up and just keep an eye on the people around you.