I agree with the people, who say that it is not necessary to label oneself.
Sexuality is a lot more fluid than most people think, so trying really hard to label oneself may be a waste of time. It may change after all. I do see, how people like to belong to a group and therefore put a label on themselves. But if it's a struggle to define one's sexuality at the moment, it might be best to simply ignore labels for the moment and just see how things are going.
That's my opinion, at least.