Well, I guess there are a number of things to consider, Rosey.
How receptive would your parents be about any aspect of gender identity? Would they listen and try to understand? Or would they totally go off the deep end and make things a hundred times worse for you?
You can only talk about how you feel, and if you feel that you're not sure, and you're having issues with your gender identity, then that's pretty much all you can tell them, right? You can't tell them something that you don't know for sure is or isn't true.
However, if your parents will be accommodating, and if you do decide to tell them you're giving your gender identity some thought, maybe you will all be able to decide on a therapist in your area who specialises in gender issues... someone who may be able to help you work some of your feelings out. Then you could have a better idea of where you stand and how you feel.
If you feel your parents wouldn't understand anything to do with gender identity and the confusion you have, would it be possible for you to see a therapist without them knowing? A way to talk things though and maybe get a firmer idea of how you feel so at least you can go some way to getting things clear in your own mind before trying to get it clear in their, and anyone else's mind.