To me it indicates a healthy desire to explore the extremes of your sexuality. The fact (I'm assuming) that you've never actually enacted any of these fantasies would indicate that you're both repressed and curious simultaneously, leading to such extremes.
If possible, go find someone who's into such extremes. Chances are when it comes time to make good on it, you'll find yourself unable to. If you DO find yourself in your comfort zone, you've found it.
Nothing wrong with a bit of gratuitous sadism.
And yes, you're gay. Everyone's a little gay.