What is a fun bike for backroads?

I’m 17 and really have fallen in love with bikes, however even just driving my small car in my area I’ve realized how stupid others drive. I’ve always preferred driving backroads anyway. I’m looking to get a bike that is on the cheaper side and not too big. I prefer the look of a sport bike but I also know that I am stupid and would probably get myself hurt or get into legal trouble. Just looking for advice.