Building upon what else is said here in answers, maybe you can brainstorm a world history board game? or a game period. What i've noticed with the good teachers I've had is that they have good sense in placing the students in various roles that they will do well in. For example, if you're making a board game, you assign the "artists" for the 'artists job' and so forth. Of course, this requires a lot of personality assessments...
Your subject can be very interesting if you know what stories to bring up, and how to say it. I had a political teacher who was superb in this-- telling us stories, little trivias, and facts that piqued our interests. When you're doing your research, you should take note of the strong and colorful personalities of people in history, or strange and different events that can be easily remembered.
In our school, we had competitions against each class-- usually it's a play, where we have complete control over. Scripting is made by a student, director is a student, costume is made by a student, and you're only there to approve or give suggestions. I don't know if this can work where you live, because it also depends on the general students' attitude.
Oh! I also just remembered- perhaps you can ask their opinions on certain topics that come out. For example, if you're telling stories about Elisabeth Bathory (I know, not American history, but humour me), ask them their thoughts upon finding out she murdered all those girls for just her skin? Questions that provoke a teen's dark interest and developing opinions will often get them to participate. Of course, now there's that issue on how you can get those stories into the lesson plan...
Don't worry about your own style. You really won't develop it if you try on different methods like a tshirt. Let it come naturally for you, think of what works and what doesn't work. Build it up, instead of trying things out.
Someone here said "don't try to be a bud." Personally, I like friendly teachers. Buuut the advice is good, because being a "bud" is very hard to accomplish-- you can either be loved for being exactly a friend they wanted-- or hated for trying to fit in.