If that's in the US I'm pretty sure that's not street-legal. Bikes are until you add a motor, in which case it's a motorcycle and you have to have a motorcycle license and plates. Hope you don't get arrested because stuff like that is cool.
What also sucks is that you can't ride it on SIDEWALKS, either. No motor-vehicles on sidewalks. Has to be licensed or nonmotorized to be on the road. It's dumb. Dunno how local that is though so you might've been good until you got onto the road.