Yes, what you described is "Bisexual". However, it is not a permanent label. When you are thinking of or having sex with a male, you are straight in that moment. Whenever you think about, or have sex with a girl, you are lesbian. Your entire life is not dictated by this, only in those moments. Obviously, if you are thinking of or having sex with a guy and a girl, you are Bisexual.
What people are sexually attracted to are directly related to their environment, its a nurture over nature. What is common with people who watch pornography, is that there is a constant progression in what they find sexually stimulating. Over time, they no longer find stimulation over nude photos but need more erotic behavior to satisfy themselves. However, this process can also be reversed.
For you, there were thousands of various different things that happened in your life that opened the door in your mind to accept females as suitable sexual stimulation. The more you explore this in your mind, the more likely you will be to seek out a physical female partner. You are likely experiencing a different feeling because of the "taboo" aspect of pushing the bounds of what is "sexually acceptable". This is likely to fade after you no longer feel that way and are more open and unafraid of people's thoughts about you.
You are not "Labeled" because as I said, it's due to environment, and it can be reversed if you didn't want to be attracted to males or females. When you are at school, or driving in your car, your sexual preferences don't define you whatsoever. Only in those moments when you think or do, can you label yourself as anything. Hope this helps.