Yeah…I'm in my mid-twenties and I've never really figured out what my sexuality is (mainly because I've never dated) and I doubt I'll ever know. My momentary preferences seem to change somewhat…like right now I'm more interested in the "opposite gender"…I say that with quotes as I don't really know what gender even is, I'm just going by opposite by saying someone who has a physical body less familiar to me.
So you're less confused than me it seems…could be wrong, but at least you're not alone.