I think you already answered your question, kind of, when you started out by saying you're a 15 year old straight female, but you know, you've never been any older but 15 is really really y0ung. You probably don't have real sexual experience, just fantasies, at this point. When you start actually having sexual relationships you'll find out. I kind of think you're right, we're probably all bisexual to an extent, that seems to be the case historically. It's also true there's a whole lot more information available now than there used to be. I think thinking about things is what humans do. Obsessing about things to the point you're making yourself unhappy isn't. That's probably the problem you want to focus on for now, as time is the only thing that will fully answer what you're true sexuality is. Remember, if you close your eyes, everything feels good. With your eyes open, that's when you notice the difference. But true feelings of attachment are very different than feelings of sexual lust. Again, you will find that out, it's inevitable with time, but you don't want to spend this much of your life ruminating on things if it makes you unhappy. Peace.